diff --git a/scene/2d/area_2d.cpp b/scene/2d/area_2d.cpp
index 84877b13c22..2ea7a8d6aef 100644
--- a/scene/2d/area_2d.cpp
+++ b/scene/2d/area_2d.cpp
@@ -135,7 +135,7 @@ int Area2D::get_priority() const {
 void Area2D::_body_enter_tree(ObjectID p_id) {
 	Object *obj = ObjectDB::get_instance(p_id);
 	Node *node = Object::cast_to<Node>(obj);
-	ERR_FAIL_COND(!node);
+	ERR_FAIL_NULL(node);
 
 	HashMap<ObjectID, BodyState>::Iterator E = body_map.find(p_id);
 	ERR_FAIL_COND(!E);
@@ -151,7 +151,7 @@ void Area2D::_body_enter_tree(ObjectID p_id) {
 void Area2D::_body_exit_tree(ObjectID p_id) {
 	Object *obj = ObjectDB::get_instance(p_id);
 	Node *node = Object::cast_to<Node>(obj);
-	ERR_FAIL_COND(!node);
+	ERR_FAIL_NULL(node);
 	HashMap<ObjectID, BodyState>::Iterator E = body_map.find(p_id);
 	ERR_FAIL_COND(!E);
 	ERR_FAIL_COND(!E->value.in_tree);
@@ -231,7 +231,7 @@ void Area2D::_body_inout(int p_status, const RID &p_body, ObjectID p_instance, i
 void Area2D::_area_enter_tree(ObjectID p_id) {
 	Object *obj = ObjectDB::get_instance(p_id);
 	Node *node = Object::cast_to<Node>(obj);
-	ERR_FAIL_COND(!node);
+	ERR_FAIL_NULL(node);
 
 	HashMap<ObjectID, AreaState>::Iterator E = area_map.find(p_id);
 	ERR_FAIL_COND(!E);
@@ -247,7 +247,7 @@ void Area2D::_area_enter_tree(ObjectID p_id) {
 void Area2D::_area_exit_tree(ObjectID p_id) {
 	Object *obj = ObjectDB::get_instance(p_id);
 	Node *node = Object::cast_to<Node>(obj);
-	ERR_FAIL_COND(!node);
+	ERR_FAIL_NULL(node);
 	HashMap<ObjectID, AreaState>::Iterator E = area_map.find(p_id);
 	ERR_FAIL_COND(!E);
 	ERR_FAIL_COND(!E->value.in_tree);
diff --git a/scene/2d/cpu_particles_2d.cpp b/scene/2d/cpu_particles_2d.cpp
index af943acb320..115104adff8 100644
--- a/scene/2d/cpu_particles_2d.cpp
+++ b/scene/2d/cpu_particles_2d.cpp
@@ -1163,7 +1163,7 @@ void CPUParticles2D::_notification(int p_what) {
 
 void CPUParticles2D::convert_from_particles(Node *p_particles) {
 	GPUParticles2D *gpu_particles = Object::cast_to<GPUParticles2D>(p_particles);
-	ERR_FAIL_COND_MSG(!gpu_particles, "Only GPUParticles2D nodes can be converted to CPUParticles2D.");
+	ERR_FAIL_NULL_MSG(gpu_particles, "Only GPUParticles2D nodes can be converted to CPUParticles2D.");
 
 	set_emitting(gpu_particles->is_emitting());
 	set_amount(gpu_particles->get_amount());
diff --git a/scene/2d/node_2d.cpp b/scene/2d/node_2d.cpp
index a0eab67f289..4b7fad5edf0 100644
--- a/scene/2d/node_2d.cpp
+++ b/scene/2d/node_2d.cpp
@@ -403,7 +403,7 @@ Transform2D Node2D::get_relative_transform_to_parent(const Node *p_parent) const
 
 	Node2D *parent_2d = Object::cast_to<Node2D>(get_parent());
 
-	ERR_FAIL_COND_V(!parent_2d, Transform2D());
+	ERR_FAIL_NULL_V(parent_2d, Transform2D());
 	if (p_parent == parent_2d) {
 		return get_transform();
 	} else {
diff --git a/scene/2d/physics_body_2d.cpp b/scene/2d/physics_body_2d.cpp
index 1b59351b303..b3acc1849be 100644
--- a/scene/2d/physics_body_2d.cpp
+++ b/scene/2d/physics_body_2d.cpp
@@ -162,14 +162,14 @@ TypedArray<PhysicsBody2D> PhysicsBody2D::get_collision_exceptions() {
 void PhysicsBody2D::add_collision_exception_with(Node *p_node) {
 	ERR_FAIL_NULL(p_node);
 	PhysicsBody2D *physics_body = Object::cast_to<PhysicsBody2D>(p_node);
-	ERR_FAIL_COND_MSG(!physics_body, "Collision exception only works between two nodes that inherit from PhysicsBody2D.");
+	ERR_FAIL_NULL_MSG(physics_body, "Collision exception only works between two nodes that inherit from PhysicsBody2D.");
 	PhysicsServer2D::get_singleton()->body_add_collision_exception(get_rid(), physics_body->get_rid());
 }
 
 void PhysicsBody2D::remove_collision_exception_with(Node *p_node) {
 	ERR_FAIL_NULL(p_node);
 	PhysicsBody2D *physics_body = Object::cast_to<PhysicsBody2D>(p_node);
-	ERR_FAIL_COND_MSG(!physics_body, "Collision exception only works between two nodes that inherit from PhysicsBody2D.");
+	ERR_FAIL_NULL_MSG(physics_body, "Collision exception only works between two nodes that inherit from PhysicsBody2D.");
 	PhysicsServer2D::get_singleton()->body_remove_collision_exception(get_rid(), physics_body->get_rid());
 }
 
@@ -323,9 +323,8 @@ AnimatableBody2D::AnimatableBody2D() :
 void RigidBody2D::_body_enter_tree(ObjectID p_id) {
 	Object *obj = ObjectDB::get_instance(p_id);
 	Node *node = Object::cast_to<Node>(obj);
-	ERR_FAIL_COND(!node);
-
-	ERR_FAIL_COND(!contact_monitor);
+	ERR_FAIL_NULL(node);
+	ERR_FAIL_NULL(contact_monitor);
 	HashMap<ObjectID, BodyState>::Iterator E = contact_monitor->body_map.find(p_id);
 	ERR_FAIL_COND(!E);
 	ERR_FAIL_COND(E->value.in_scene);
@@ -345,8 +344,8 @@ void RigidBody2D::_body_enter_tree(ObjectID p_id) {
 void RigidBody2D::_body_exit_tree(ObjectID p_id) {
 	Object *obj = ObjectDB::get_instance(p_id);
 	Node *node = Object::cast_to<Node>(obj);
-	ERR_FAIL_COND(!node);
-	ERR_FAIL_COND(!contact_monitor);
+	ERR_FAIL_NULL(node);
+	ERR_FAIL_NULL(contact_monitor);
 	HashMap<ObjectID, BodyState>::Iterator E = contact_monitor->body_map.find(p_id);
 	ERR_FAIL_COND(!E);
 	ERR_FAIL_COND(!E->value.in_scene);
@@ -370,7 +369,7 @@ void RigidBody2D::_body_inout(int p_status, const RID &p_body, ObjectID p_instan
 	Object *obj = ObjectDB::get_instance(objid);
 	Node *node = Object::cast_to<Node>(obj);
 
-	ERR_FAIL_COND(!contact_monitor);
+	ERR_FAIL_NULL(contact_monitor);
 	HashMap<ObjectID, BodyState>::Iterator E = contact_monitor->body_map.find(objid);
 
 	ERR_FAIL_COND(!body_in && !E);
@@ -849,7 +848,7 @@ RigidBody2D::CCDMode RigidBody2D::get_continuous_collision_detection_mode() cons
 }
 
 TypedArray<Node2D> RigidBody2D::get_colliding_bodies() const {
-	ERR_FAIL_COND_V(!contact_monitor, TypedArray<Node2D>());
+	ERR_FAIL_NULL_V(contact_monitor, TypedArray<Node2D>());
 
 	TypedArray<Node2D> ret;
 	ret.resize(contact_monitor->body_map.size());
diff --git a/scene/2d/ray_cast_2d.cpp b/scene/2d/ray_cast_2d.cpp
index 988ea87054b..f27ac169b67 100644
--- a/scene/2d/ray_cast_2d.cpp
+++ b/scene/2d/ray_cast_2d.cpp
@@ -183,7 +183,7 @@ void RayCast2D::_update_raycast_state() {
 	ERR_FAIL_COND(w2d.is_null());
 
 	PhysicsDirectSpaceState2D *dss = PhysicsServer2D::get_singleton()->space_get_direct_state(w2d->get_space());
-	ERR_FAIL_COND(!dss);
+	ERR_FAIL_NULL(dss);
 
 	Transform2D gt = get_global_transform();
 
diff --git a/scene/2d/shape_cast_2d.cpp b/scene/2d/shape_cast_2d.cpp
index 5b743e0b319..f1a9119458c 100644
--- a/scene/2d/shape_cast_2d.cpp
+++ b/scene/2d/shape_cast_2d.cpp
@@ -293,7 +293,7 @@ void ShapeCast2D::_update_shapecast_state() {
 	ERR_FAIL_COND(w2d.is_null());
 
 	PhysicsDirectSpaceState2D *dss = PhysicsServer2D::get_singleton()->space_get_direct_state(w2d->get_space());
-	ERR_FAIL_COND(!dss);
+	ERR_FAIL_NULL(dss);
 
 	Transform2D gt = get_global_transform();
 
diff --git a/scene/2d/skeleton_2d.cpp b/scene/2d/skeleton_2d.cpp
index f2270d2b18a..c31b42bebaf 100644
--- a/scene/2d/skeleton_2d.cpp
+++ b/scene/2d/skeleton_2d.cpp
@@ -406,7 +406,7 @@ void Bone2D::apply_rest() {
 }
 
 int Bone2D::get_index_in_skeleton() const {
-	ERR_FAIL_COND_V(!skeleton, -1);
+	ERR_FAIL_NULL_V(skeleton, -1);
 	skeleton->_update_bone_setup();
 	return skeleton_index;
 }
diff --git a/scene/3d/area_3d.cpp b/scene/3d/area_3d.cpp
index 47912ad261d..fbf928f3f42 100644
--- a/scene/3d/area_3d.cpp
+++ b/scene/3d/area_3d.cpp
@@ -190,7 +190,7 @@ void Area3D::_initialize_wind() {
 void Area3D::_body_enter_tree(ObjectID p_id) {
 	Object *obj = ObjectDB::get_instance(p_id);
 	Node *node = Object::cast_to<Node>(obj);
-	ERR_FAIL_COND(!node);
+	ERR_FAIL_NULL(node);
 
 	HashMap<ObjectID, BodyState>::Iterator E = body_map.find(p_id);
 	ERR_FAIL_COND(!E);
@@ -206,7 +206,7 @@ void Area3D::_body_enter_tree(ObjectID p_id) {
 void Area3D::_body_exit_tree(ObjectID p_id) {
 	Object *obj = ObjectDB::get_instance(p_id);
 	Node *node = Object::cast_to<Node>(obj);
-	ERR_FAIL_COND(!node);
+	ERR_FAIL_NULL(node);
 	HashMap<ObjectID, BodyState>::Iterator E = body_map.find(p_id);
 	ERR_FAIL_COND(!E);
 	ERR_FAIL_COND(!E->value.in_tree);
@@ -379,7 +379,7 @@ void Area3D::set_monitoring(bool p_enable) {
 void Area3D::_area_enter_tree(ObjectID p_id) {
 	Object *obj = ObjectDB::get_instance(p_id);
 	Node *node = Object::cast_to<Node>(obj);
-	ERR_FAIL_COND(!node);
+	ERR_FAIL_NULL(node);
 
 	HashMap<ObjectID, AreaState>::Iterator E = area_map.find(p_id);
 	ERR_FAIL_COND(!E);
@@ -395,7 +395,7 @@ void Area3D::_area_enter_tree(ObjectID p_id) {
 void Area3D::_area_exit_tree(ObjectID p_id) {
 	Object *obj = ObjectDB::get_instance(p_id);
 	Node *node = Object::cast_to<Node>(obj);
-	ERR_FAIL_COND(!node);
+	ERR_FAIL_NULL(node);
 	HashMap<ObjectID, AreaState>::Iterator E = area_map.find(p_id);
 	ERR_FAIL_COND(!E);
 	ERR_FAIL_COND(!E->value.in_tree);
diff --git a/scene/3d/bone_attachment_3d.cpp b/scene/3d/bone_attachment_3d.cpp
index ba5ff028624..261bd401d4b 100644
--- a/scene/3d/bone_attachment_3d.cpp
+++ b/scene/3d/bone_attachment_3d.cpp
@@ -112,11 +112,11 @@ void BoneAttachment3D::_update_external_skeleton_cache() {
 	external_skeleton_node_cache = ObjectID();
 	if (has_node(external_skeleton_node)) {
 		Node *node = get_node(external_skeleton_node);
-		ERR_FAIL_COND_MSG(!node, "Cannot update external skeleton cache: Node cannot be found!");
+		ERR_FAIL_NULL_MSG(node, "Cannot update external skeleton cache: Node cannot be found!");
 
 		// Make sure it's a skeleton3D
 		Skeleton3D *sk = Object::cast_to<Skeleton3D>(node);
-		ERR_FAIL_COND_MSG(!sk, "Cannot update external skeleton cache: Skeleton3D Nodepath does not point to a Skeleton3D node!");
+		ERR_FAIL_NULL_MSG(sk, "Cannot update external skeleton cache: Skeleton3D Nodepath does not point to a Skeleton3D node!");
 
 		external_skeleton_node_cache = node->get_instance_id();
 	} else {
@@ -126,11 +126,11 @@ void BoneAttachment3D::_update_external_skeleton_cache() {
 				parent_attachment->_update_external_skeleton_cache();
 				if (parent_attachment->has_node(parent_attachment->external_skeleton_node)) {
 					Node *node = parent_attachment->get_node(parent_attachment->external_skeleton_node);
-					ERR_FAIL_COND_MSG(!node, "Cannot update external skeleton cache: Parent's Skeleton3D node cannot be found!");
+					ERR_FAIL_NULL_MSG(node, "Cannot update external skeleton cache: Parent's Skeleton3D node cannot be found!");
 
 					// Make sure it's a skeleton3D
 					Skeleton3D *sk = Object::cast_to<Skeleton3D>(node);
-					ERR_FAIL_COND_MSG(!sk, "Cannot update external skeleton cache: Parent Skeleton3D Nodepath does not point to a Skeleton3D node!");
+					ERR_FAIL_NULL_MSG(sk, "Cannot update external skeleton cache: Parent Skeleton3D Nodepath does not point to a Skeleton3D node!");
 
 					external_skeleton_node_cache = node->get_instance_id();
 					external_skeleton_node = get_path_to(node);
@@ -190,7 +190,7 @@ void BoneAttachment3D::_transform_changed() {
 	if (override_pose) {
 		Skeleton3D *sk = _get_skeleton3d();
 
-		ERR_FAIL_COND_MSG(!sk, "Cannot override pose: Skeleton not found!");
+		ERR_FAIL_NULL_MSG(sk, "Cannot override pose: Skeleton not found!");
 		ERR_FAIL_INDEX_MSG(bone_idx, sk->get_bone_count(), "Cannot override pose: Bone index is out of range!");
 
 		Transform3D our_trans = get_transform();
diff --git a/scene/3d/camera_3d.cpp b/scene/3d/camera_3d.cpp
index 47eb1eaa40c..5a4761892d1 100644
--- a/scene/3d/camera_3d.cpp
+++ b/scene/3d/camera_3d.cpp
@@ -106,7 +106,7 @@ void Camera3D::_notification(int p_what) {
 			// and Spatial will handle it first, including clearing its reference to the Viewport,
 			// therefore making it impossible to subclasses to access it
 			viewport = get_viewport();
-			ERR_FAIL_COND(!viewport);
+			ERR_FAIL_NULL(viewport);
 
 			bool first_camera = viewport->_camera_3d_add(this);
 			if (current || first_camera) {
@@ -454,7 +454,7 @@ Ref<CameraAttributes> Camera3D::get_attributes() const {
 
 void Camera3D::_attributes_changed() {
 	CameraAttributesPhysical *physical_attributes = Object::cast_to<CameraAttributesPhysical>(attributes.ptr());
-	ERR_FAIL_COND(!physical_attributes);
+	ERR_FAIL_NULL(physical_attributes);
 
 	fov = physical_attributes->get_fov();
 	near = physical_attributes->get_near();
diff --git a/scene/3d/cpu_particles_3d.cpp b/scene/3d/cpu_particles_3d.cpp
index 72d16b345f7..405d478a475 100644
--- a/scene/3d/cpu_particles_3d.cpp
+++ b/scene/3d/cpu_particles_3d.cpp
@@ -1327,7 +1327,7 @@ void CPUParticles3D::_notification(int p_what) {
 
 void CPUParticles3D::convert_from_particles(Node *p_particles) {
 	GPUParticles3D *gpu_particles = Object::cast_to<GPUParticles3D>(p_particles);
-	ERR_FAIL_COND_MSG(!gpu_particles, "Only GPUParticles3D nodes can be converted to CPUParticles3D.");
+	ERR_FAIL_NULL_MSG(gpu_particles, "Only GPUParticles3D nodes can be converted to CPUParticles3D.");
 
 	set_emitting(gpu_particles->is_emitting());
 	set_amount(gpu_particles->get_amount());
diff --git a/scene/3d/label_3d.cpp b/scene/3d/label_3d.cpp
index 198fb70ad75..810c0c53266 100644
--- a/scene/3d/label_3d.cpp
+++ b/scene/3d/label_3d.cpp
@@ -204,12 +204,12 @@ void Label3D::_notification(int p_what) {
 				_im_update();
 			}
 			Viewport *viewport = get_viewport();
-			ERR_FAIL_COND(!viewport);
+			ERR_FAIL_NULL(viewport);
 			viewport->connect("size_changed", callable_mp(this, &Label3D::_font_changed));
 		} break;
 		case NOTIFICATION_EXIT_TREE: {
 			Viewport *viewport = get_viewport();
-			ERR_FAIL_COND(!viewport);
+			ERR_FAIL_NULL(viewport);
 			viewport->disconnect("size_changed", callable_mp(this, &Label3D::_font_changed));
 		} break;
 		case NOTIFICATION_TRANSLATION_CHANGED: {
diff --git a/scene/3d/mesh_instance_3d.cpp b/scene/3d/mesh_instance_3d.cpp
index 0f7db64f5c4..28a3cd0b13d 100644
--- a/scene/3d/mesh_instance_3d.cpp
+++ b/scene/3d/mesh_instance_3d.cpp
@@ -243,7 +243,7 @@ Node *MeshInstance3D::create_trimesh_collision_node() {
 
 void MeshInstance3D::create_trimesh_collision() {
 	StaticBody3D *static_body = Object::cast_to<StaticBody3D>(create_trimesh_collision_node());
-	ERR_FAIL_COND(!static_body);
+	ERR_FAIL_NULL(static_body);
 	static_body->set_name(String(get_name()) + "_col");
 
 	add_child(static_body, true);
@@ -273,7 +273,7 @@ Node *MeshInstance3D::create_convex_collision_node(bool p_clean, bool p_simplify
 
 void MeshInstance3D::create_convex_collision(bool p_clean, bool p_simplify) {
 	StaticBody3D *static_body = Object::cast_to<StaticBody3D>(create_convex_collision_node(p_clean, p_simplify));
-	ERR_FAIL_COND(!static_body);
+	ERR_FAIL_NULL(static_body);
 	static_body->set_name(String(get_name()) + "_col");
 
 	add_child(static_body, true);
@@ -312,7 +312,7 @@ Node *MeshInstance3D::create_multiple_convex_collisions_node(const Ref<MeshConve
 
 void MeshInstance3D::create_multiple_convex_collisions(const Ref<MeshConvexDecompositionSettings> &p_settings) {
 	StaticBody3D *static_body = Object::cast_to<StaticBody3D>(create_multiple_convex_collisions_node(p_settings));
-	ERR_FAIL_COND(!static_body);
+	ERR_FAIL_NULL(static_body);
 	static_body->set_name(String(get_name()) + "_col");
 
 	add_child(static_body, true);
diff --git a/scene/3d/node_3d.cpp b/scene/3d/node_3d.cpp
index 4f2ee5a3b2d..932e4ea549f 100644
--- a/scene/3d/node_3d.cpp
+++ b/scene/3d/node_3d.cpp
@@ -135,7 +135,7 @@ void Node3D::_notification(int p_what) {
 
 	switch (p_what) {
 		case NOTIFICATION_ENTER_TREE: {
-			ERR_FAIL_COND(!get_tree());
+			ERR_FAIL_NULL(get_tree());
 
 			Node *p = get_parent();
 			if (p) {
@@ -186,7 +186,7 @@ void Node3D::_notification(int p_what) {
 				parent = parent->get_parent();
 			}
 
-			ERR_FAIL_COND(!data.viewport);
+			ERR_FAIL_NULL(data.viewport);
 
 			if (get_script_instance()) {
 				get_script_instance()->call(SceneStringNames::get_singleton()->_enter_world);
@@ -379,7 +379,7 @@ Transform3D Node3D::get_relative_transform(const Node *p_parent) const {
 		return Transform3D();
 	}
 
-	ERR_FAIL_COND_V(!data.parent, Transform3D());
+	ERR_FAIL_NULL_V(data.parent, Transform3D());
 
 	if (p_parent == data.parent) {
 		return get_transform();
@@ -743,7 +743,7 @@ bool Node3D::is_set_as_top_level() const {
 Ref<World3D> Node3D::get_world_3d() const {
 	ERR_READ_THREAD_GUARD_V(Ref<World3D>()); // World3D can only be set from main thread, so it's safe to obtain on threads.
 	ERR_FAIL_COND_V(!is_inside_world(), Ref<World3D>());
-	ERR_FAIL_COND_V(!data.viewport, Ref<World3D>());
+	ERR_FAIL_NULL_V(data.viewport, Ref<World3D>());
 
 	return data.viewport->find_world_3d();
 }
@@ -977,10 +977,10 @@ void Node3D::_update_visibility_parent(bool p_update_root) {
 			return;
 		}
 		Node *parent = get_node_or_null(visibility_parent_path);
-		ERR_FAIL_COND_MSG(!parent, "Can't find visibility parent node at path: " + visibility_parent_path);
+		ERR_FAIL_NULL_MSG(parent, "Can't find visibility parent node at path: " + visibility_parent_path);
 		ERR_FAIL_COND_MSG(parent == this, "The visibility parent can't be the same node.");
 		GeometryInstance3D *gi = Object::cast_to<GeometryInstance3D>(parent);
-		ERR_FAIL_COND_MSG(!gi, "The visibility parent node must be a GeometryInstance3D, at path: " + visibility_parent_path);
+		ERR_FAIL_NULL_MSG(gi, "The visibility parent node must be a GeometryInstance3D, at path: " + visibility_parent_path);
 		new_parent = gi ? gi->get_instance() : RID();
 	} else if (data.parent) {
 		new_parent = data.parent->data.visibility_parent;
diff --git a/scene/3d/occluder_instance_3d.cpp b/scene/3d/occluder_instance_3d.cpp
index 594580a205b..8fd1df372b8 100644
--- a/scene/3d/occluder_instance_3d.cpp
+++ b/scene/3d/occluder_instance_3d.cpp
@@ -605,7 +605,7 @@ void OccluderInstance3D::_bake_node(Node *p_node, PackedVector3Array &r_vertices
 }
 
 void OccluderInstance3D::bake_single_node(const Node3D *p_node, float p_simplification_distance, PackedVector3Array &r_vertices, PackedInt32Array &r_indices) {
-	ERR_FAIL_COND(!p_node);
+	ERR_FAIL_NULL(p_node);
 
 	Transform3D xform = p_node->is_inside_tree() ? p_node->get_global_transform() : p_node->get_transform();
 
diff --git a/scene/3d/physics_body_3d.cpp b/scene/3d/physics_body_3d.cpp
index 4be695d189e..c8becc230b2 100644
--- a/scene/3d/physics_body_3d.cpp
+++ b/scene/3d/physics_body_3d.cpp
@@ -80,14 +80,14 @@ TypedArray<PhysicsBody3D> PhysicsBody3D::get_collision_exceptions() {
 void PhysicsBody3D::add_collision_exception_with(Node *p_node) {
 	ERR_FAIL_NULL(p_node);
 	CollisionObject3D *collision_object = Object::cast_to<CollisionObject3D>(p_node);
-	ERR_FAIL_COND_MSG(!collision_object, "Collision exception only works between two nodes that inherit from CollisionObject3D (such as Area3D or PhysicsBody3D).");
+	ERR_FAIL_NULL_MSG(collision_object, "Collision exception only works between two nodes that inherit from CollisionObject3D (such as Area3D or PhysicsBody3D).");
 	PhysicsServer3D::get_singleton()->body_add_collision_exception(get_rid(), collision_object->get_rid());
 }
 
 void PhysicsBody3D::remove_collision_exception_with(Node *p_node) {
 	ERR_FAIL_NULL(p_node);
 	CollisionObject3D *collision_object = Object::cast_to<CollisionObject3D>(p_node);
-	ERR_FAIL_COND_MSG(!collision_object, "Collision exception only works between two nodes that inherit from CollisionObject3D (such as Area3D or PhysicsBody3D).");
+	ERR_FAIL_NULL_MSG(collision_object, "Collision exception only works between two nodes that inherit from CollisionObject3D (such as Area3D or PhysicsBody3D).");
 	PhysicsServer3D::get_singleton()->body_remove_collision_exception(get_rid(), collision_object->get_rid());
 }
 
@@ -379,9 +379,8 @@ AnimatableBody3D::AnimatableBody3D() :
 void RigidBody3D::_body_enter_tree(ObjectID p_id) {
 	Object *obj = ObjectDB::get_instance(p_id);
 	Node *node = Object::cast_to<Node>(obj);
-	ERR_FAIL_COND(!node);
-
-	ERR_FAIL_COND(!contact_monitor);
+	ERR_FAIL_NULL(node);
+	ERR_FAIL_NULL(contact_monitor);
 	HashMap<ObjectID, BodyState>::Iterator E = contact_monitor->body_map.find(p_id);
 	ERR_FAIL_COND(!E);
 	ERR_FAIL_COND(E->value.in_tree);
@@ -402,8 +401,8 @@ void RigidBody3D::_body_enter_tree(ObjectID p_id) {
 void RigidBody3D::_body_exit_tree(ObjectID p_id) {
 	Object *obj = ObjectDB::get_instance(p_id);
 	Node *node = Object::cast_to<Node>(obj);
-	ERR_FAIL_COND(!node);
-	ERR_FAIL_COND(!contact_monitor);
+	ERR_FAIL_NULL(node);
+	ERR_FAIL_NULL(contact_monitor);
 	HashMap<ObjectID, BodyState>::Iterator E = contact_monitor->body_map.find(p_id);
 	ERR_FAIL_COND(!E);
 	ERR_FAIL_COND(!E->value.in_tree);
@@ -427,7 +426,7 @@ void RigidBody3D::_body_inout(int p_status, const RID &p_body, ObjectID p_instan
 	Object *obj = ObjectDB::get_instance(objid);
 	Node *node = Object::cast_to<Node>(obj);
 
-	ERR_FAIL_COND(!contact_monitor);
+	ERR_FAIL_NULL(contact_monitor);
 	HashMap<ObjectID, BodyState>::Iterator E = contact_monitor->body_map.find(objid);
 
 	ERR_FAIL_COND(!body_in && !E);
@@ -962,7 +961,7 @@ bool RigidBody3D::is_contact_monitor_enabled() const {
 }
 
 TypedArray<Node3D> RigidBody3D::get_colliding_bodies() const {
-	ERR_FAIL_COND_V(!contact_monitor, TypedArray<Node3D>());
+	ERR_FAIL_NULL_V(contact_monitor, TypedArray<Node3D>());
 
 	TypedArray<Node3D> ret;
 	ret.resize(contact_monitor->body_map.size());
diff --git a/scene/3d/ray_cast_3d.cpp b/scene/3d/ray_cast_3d.cpp
index c4e1f8e8d16..2dea6418ed2 100644
--- a/scene/3d/ray_cast_3d.cpp
+++ b/scene/3d/ray_cast_3d.cpp
@@ -206,7 +206,7 @@ void RayCast3D::_update_raycast_state() {
 	ERR_FAIL_COND(w3d.is_null());
 
 	PhysicsDirectSpaceState3D *dss = PhysicsServer3D::get_singleton()->space_get_direct_state(w3d->get_space());
-	ERR_FAIL_COND(!dss);
+	ERR_FAIL_NULL(dss);
 
 	Transform3D gt = get_global_transform();
 
diff --git a/scene/3d/shape_cast_3d.cpp b/scene/3d/shape_cast_3d.cpp
index 602eb664dd0..75f94b36d38 100644
--- a/scene/3d/shape_cast_3d.cpp
+++ b/scene/3d/shape_cast_3d.cpp
@@ -385,7 +385,7 @@ void ShapeCast3D::_update_shapecast_state() {
 	ERR_FAIL_COND(w3d.is_null());
 
 	PhysicsDirectSpaceState3D *dss = PhysicsServer3D::get_singleton()->space_get_direct_state(w3d->get_space());
-	ERR_FAIL_COND(!dss);
+	ERR_FAIL_NULL(dss);
 
 	Transform3D gt = get_global_transform();
 
diff --git a/scene/3d/skeleton_3d.cpp b/scene/3d/skeleton_3d.cpp
index ae73551007e..51359059ef0 100644
--- a/scene/3d/skeleton_3d.cpp
+++ b/scene/3d/skeleton_3d.cpp
@@ -680,7 +680,7 @@ void Skeleton3D::bind_physical_bone_to_bone(int p_bone, PhysicalBone3D *p_physic
 	const int bone_size = bones.size();
 	ERR_FAIL_INDEX(p_bone, bone_size);
 	ERR_FAIL_COND(bones[p_bone].physical_bone);
-	ERR_FAIL_COND(!p_physical_bone);
+	ERR_FAIL_NULL(p_physical_bone);
 	bones.write[p_bone].physical_bone = p_physical_bone;
 
 	_rebuild_physical_bones_cache();
diff --git a/scene/3d/soft_body_3d.cpp b/scene/3d/soft_body_3d.cpp
index 9fa33e9d5ce..d1753fff6c8 100644
--- a/scene/3d/soft_body_3d.cpp
+++ b/scene/3d/soft_body_3d.cpp
@@ -593,14 +593,14 @@ TypedArray<PhysicsBody3D> SoftBody3D::get_collision_exceptions() {
 void SoftBody3D::add_collision_exception_with(Node *p_node) {
 	ERR_FAIL_NULL(p_node);
 	CollisionObject3D *collision_object = Object::cast_to<CollisionObject3D>(p_node);
-	ERR_FAIL_COND_MSG(!collision_object, "Collision exception only works between two nodes that inherit from CollisionObject3D (such as Area3D or PhysicsBody3D).");
+	ERR_FAIL_NULL_MSG(collision_object, "Collision exception only works between two nodes that inherit from CollisionObject3D (such as Area3D or PhysicsBody3D).");
 	PhysicsServer3D::get_singleton()->soft_body_add_collision_exception(physics_rid, collision_object->get_rid());
 }
 
 void SoftBody3D::remove_collision_exception_with(Node *p_node) {
 	ERR_FAIL_NULL(p_node);
 	CollisionObject3D *collision_object = Object::cast_to<CollisionObject3D>(p_node);
-	ERR_FAIL_COND_MSG(!collision_object, "Collision exception only works between two nodes that inherit from CollisionObject3D (such as Area3D or PhysicsBody3D).");
+	ERR_FAIL_NULL_MSG(collision_object, "Collision exception only works between two nodes that inherit from CollisionObject3D (such as Area3D or PhysicsBody3D).");
 	PhysicsServer3D::get_singleton()->soft_body_remove_collision_exception(physics_rid, collision_object->get_rid());
 }
 
diff --git a/scene/animation/animation_blend_tree.cpp b/scene/animation/animation_blend_tree.cpp
index c1b1e6c287c..6a76b5ac168 100644
--- a/scene/animation/animation_blend_tree.cpp
+++ b/scene/animation/animation_blend_tree.cpp
@@ -66,7 +66,7 @@ void AnimationNodeAnimation::_validate_property(PropertyInfo &p_property) const
 
 double AnimationNodeAnimation::_process(double p_time, bool p_seek, bool p_is_external_seeking, bool p_test_only) {
 	AnimationPlayer *ap = state->player;
-	ERR_FAIL_COND_V(!ap, 0);
+	ERR_FAIL_NULL_V(ap, 0);
 
 	double cur_time = get_parameter(time);
 
diff --git a/scene/animation/animation_player.cpp b/scene/animation/animation_player.cpp
index ebf5d03a76d..f95a7f98bbf 100644
--- a/scene/animation/animation_player.cpp
+++ b/scene/animation/animation_player.cpp
@@ -273,7 +273,7 @@ void AnimationPlayer::_ensure_node_caches(AnimationData *p_anim, Node *p_root_ov
 
 	Node *parent = p_root_override ? p_root_override : get_node(root);
 
-	ERR_FAIL_COND(!parent);
+	ERR_FAIL_NULL(parent);
 
 	Animation *a = p_anim->animation.operator->();
 
@@ -2169,7 +2169,7 @@ Ref<AnimatedValuesBackup> AnimationPlayer::apply_reset(bool p_user_initiated) {
 	ERR_FAIL_COND_V(reset_anim.is_null(), Ref<AnimatedValuesBackup>());
 
 	Node *root_node = get_node_or_null(root);
-	ERR_FAIL_COND_V(!root_node, Ref<AnimatedValuesBackup>());
+	ERR_FAIL_NULL_V(root_node, Ref<AnimatedValuesBackup>());
 
 	AnimationPlayer *aux_player = memnew(AnimationPlayer);
 	EditorNode::get_singleton()->add_child(aux_player);
diff --git a/scene/animation/animation_tree.cpp b/scene/animation/animation_tree.cpp
index abd66905d19..23640328633 100644
--- a/scene/animation/animation_tree.cpp
+++ b/scene/animation/animation_tree.cpp
@@ -64,7 +64,7 @@ void AnimationNode::set_parameter(const StringName &p_name, const Variant &p_val
 	if (is_testing) {
 		return;
 	}
-	ERR_FAIL_COND(!state);
+	ERR_FAIL_NULL(state);
 	ERR_FAIL_COND(!state->tree->property_parent_map.has(base_path));
 	ERR_FAIL_COND(!state->tree->property_parent_map[base_path].has(p_name));
 	StringName path = state->tree->property_parent_map[base_path][p_name];
@@ -73,7 +73,7 @@ void AnimationNode::set_parameter(const StringName &p_name, const Variant &p_val
 }
 
 Variant AnimationNode::get_parameter(const StringName &p_name) const {
-	ERR_FAIL_COND_V(!state, Variant());
+	ERR_FAIL_NULL_V(state, Variant());
 	ERR_FAIL_COND_V(!state->tree->property_parent_map.has(base_path), Variant());
 	ERR_FAIL_COND_V(!state->tree->property_parent_map[base_path].has(p_name), Variant());
 
@@ -96,7 +96,7 @@ void AnimationNode::get_child_nodes(List<ChildNode> *r_child_nodes) {
 }
 
 void AnimationNode::blend_animation(const StringName &p_animation, double p_time, double p_delta, bool p_seeked, bool p_is_external_seeking, real_t p_blend, Animation::LoopedFlag p_looped_flag) {
-	ERR_FAIL_COND(!state);
+	ERR_FAIL_NULL(state);
 	ERR_FAIL_COND(!state->player->has_animation(p_animation));
 
 	Ref<Animation> animation = state->player->get_animation(p_animation);
@@ -144,12 +144,12 @@ double AnimationNode::_pre_process(const StringName &p_base_path, AnimationNode
 }
 
 AnimationTree *AnimationNode::get_animation_tree() const {
-	ERR_FAIL_COND_V(!state, nullptr);
+	ERR_FAIL_NULL_V(state, nullptr);
 	return state->tree;
 }
 
 void AnimationNode::make_invalid(const String &p_reason) {
-	ERR_FAIL_COND(!state);
+	ERR_FAIL_NULL(state);
 	state->valid = false;
 	if (!state->invalid_reasons.is_empty()) {
 		state->invalid_reasons += "\n";
@@ -159,10 +159,10 @@ void AnimationNode::make_invalid(const String &p_reason) {
 
 double AnimationNode::blend_input(int p_input, double p_time, bool p_seek, bool p_is_external_seeking, real_t p_blend, FilterAction p_filter, bool p_sync, bool p_test_only) {
 	ERR_FAIL_INDEX_V(p_input, inputs.size(), 0);
-	ERR_FAIL_COND_V(!state, 0);
+	ERR_FAIL_NULL_V(state, 0);
 
 	AnimationNodeBlendTree *blend_tree = Object::cast_to<AnimationNodeBlendTree>(parent);
-	ERR_FAIL_COND_V(!blend_tree, 0);
+	ERR_FAIL_NULL_V(blend_tree, 0);
 
 	StringName node_name = connections[p_input];
 
@@ -193,7 +193,7 @@ double AnimationNode::blend_node(const StringName &p_sub_path, Ref<AnimationNode
 
 double AnimationNode::_blend_node(const StringName &p_subpath, const Vector<StringName> &p_connections, AnimationNode *p_new_parent, Ref<AnimationNode> p_node, double p_time, bool p_seek, bool p_is_external_seeking, real_t p_blend, FilterAction p_filter, bool p_sync, real_t *r_max, bool p_test_only) {
 	ERR_FAIL_COND_V(!p_node.is_valid(), 0);
-	ERR_FAIL_COND_V(!state, 0);
+	ERR_FAIL_NULL_V(state, 0);
 
 	int blend_count = blends.size();
 
@@ -293,7 +293,7 @@ double AnimationNode::_blend_node(const StringName &p_subpath, const Vector<Stri
 		new_parent = p_new_parent;
 		new_path = String(base_path) + String(p_subpath) + "/";
 	} else {
-		ERR_FAIL_COND_V(!parent, 0);
+		ERR_FAIL_NULL_V(parent, 0);
 		new_parent = parent;
 		new_path = String(parent->base_path) + String(p_subpath) + "/";
 	}
diff --git a/scene/debugger/scene_debugger.cpp b/scene/debugger/scene_debugger.cpp
index 6df40837c5a..391388fc04d 100644
--- a/scene/debugger/scene_debugger.cpp
+++ b/scene/debugger/scene_debugger.cpp
@@ -221,7 +221,7 @@ Error SceneDebugger::parse_message(void *p_user, const String &p_msg, const Arra
 
 void SceneDebugger::_save_node(ObjectID id, const String &p_path) {
 	Node *node = Object::cast_to<Node>(ObjectDB::get_instance(id));
-	ERR_FAIL_COND(!node);
+	ERR_FAIL_NULL(node);
 
 #ifdef TOOLS_ENABLED
 	HashMap<const Node *, Node *> duplimap;
diff --git a/scene/gui/container.cpp b/scene/gui/container.cpp
index 145074a626f..2abd8cdf030 100644
--- a/scene/gui/container.cpp
+++ b/scene/gui/container.cpp
@@ -97,7 +97,7 @@ void Container::_sort_children() {
 }
 
 void Container::fit_child_in_rect(Control *p_child, const Rect2 &p_rect) {
-	ERR_FAIL_COND(!p_child);
+	ERR_FAIL_NULL(p_child);
 	ERR_FAIL_COND(p_child->get_parent() != this);
 
 	bool rtl = is_layout_rtl();
diff --git a/scene/gui/control.cpp b/scene/gui/control.cpp
index e34309df48c..160d55bf9bb 100644
--- a/scene/gui/control.cpp
+++ b/scene/gui/control.cpp
@@ -3180,7 +3180,7 @@ void Control::_notification(int p_notification) {
 			} else {
 				// Is a regular root control or top_level.
 				Viewport *viewport = get_viewport();
-				ERR_FAIL_COND(!viewport);
+				ERR_FAIL_NULL(viewport);
 				data.RI = viewport->_gui_add_root_control(this);
 
 				get_parent()->connect(SNAME("child_order_changed"), callable_mp(get_viewport(), &Viewport::gui_set_root_order_dirty), CONNECT_REFERENCE_COUNTED);
@@ -3193,7 +3193,7 @@ void Control::_notification(int p_notification) {
 			} else {
 				// Connect viewport.
 				Viewport *viewport = get_viewport();
-				ERR_FAIL_COND(!viewport);
+				ERR_FAIL_NULL(viewport);
 				viewport->connect("size_changed", callable_mp(this, &Control::_size_changed));
 			}
 		} break;
@@ -3205,7 +3205,7 @@ void Control::_notification(int p_notification) {
 			} else {
 				// Disconnect viewport.
 				Viewport *viewport = get_viewport();
-				ERR_FAIL_COND(!viewport);
+				ERR_FAIL_NULL(viewport);
 				viewport->disconnect("size_changed", callable_mp(this, &Control::_size_changed));
 			}
 
diff --git a/scene/gui/graph_edit.cpp b/scene/gui/graph_edit.cpp
index f2f98b18897..be9195e9dc4 100644
--- a/scene/gui/graph_edit.cpp
+++ b/scene/gui/graph_edit.cpp
@@ -372,7 +372,7 @@ void GraphEdit::_update_scroll() {
 
 void GraphEdit::_graph_node_raised(Node *p_gn) {
 	GraphNode *gn = Object::cast_to<GraphNode>(p_gn);
-	ERR_FAIL_COND(!gn);
+	ERR_FAIL_NULL(gn);
 	if (gn->is_comment()) {
 		move_child(gn, 0);
 	} else {
@@ -382,21 +382,21 @@ void GraphEdit::_graph_node_raised(Node *p_gn) {
 
 void GraphEdit::_graph_node_selected(Node *p_gn) {
 	GraphNode *gn = Object::cast_to<GraphNode>(p_gn);
-	ERR_FAIL_COND(!gn);
+	ERR_FAIL_NULL(gn);
 
 	emit_signal(SNAME("node_selected"), gn);
 }
 
 void GraphEdit::_graph_node_deselected(Node *p_gn) {
 	GraphNode *gn = Object::cast_to<GraphNode>(p_gn);
-	ERR_FAIL_COND(!gn);
+	ERR_FAIL_NULL(gn);
 
 	emit_signal(SNAME("node_deselected"), gn);
 }
 
 void GraphEdit::_graph_node_moved(Node *p_gn) {
 	GraphNode *gn = Object::cast_to<GraphNode>(p_gn);
-	ERR_FAIL_COND(!gn);
+	ERR_FAIL_NULL(gn);
 	top_layer->queue_redraw();
 	minimap->queue_redraw();
 	queue_redraw();
@@ -405,7 +405,7 @@ void GraphEdit::_graph_node_moved(Node *p_gn) {
 
 void GraphEdit::_graph_node_slot_updated(int p_index, Node *p_gn) {
 	GraphNode *gn = Object::cast_to<GraphNode>(p_gn);
-	ERR_FAIL_COND(!gn);
+	ERR_FAIL_NULL(gn);
 	top_layer->queue_redraw();
 	minimap->queue_redraw();
 	queue_redraw();
@@ -990,9 +990,9 @@ void GraphEdit::_top_layer_draw() {
 
 	if (connecting) {
 		Node *fromn = get_node(NodePath(connecting_from));
-		ERR_FAIL_COND(!fromn);
+		ERR_FAIL_NULL(fromn);
 		GraphNode *from = Object::cast_to<GraphNode>(fromn);
-		ERR_FAIL_COND(!from);
+		ERR_FAIL_NULL(from);
 		Vector2 pos;
 		if (connecting_out) {
 			pos = from->get_connection_output_position(connecting_index);
diff --git a/scene/gui/range.cpp b/scene/gui/range.cpp
index 97a1483204c..8db4fe42efb 100644
--- a/scene/gui/range.cpp
+++ b/scene/gui/range.cpp
@@ -236,7 +236,7 @@ double Range::get_as_ratio() const {
 
 void Range::_share(Node *p_range) {
 	Range *r = Object::cast_to<Range>(p_range);
-	ERR_FAIL_COND(!r);
+	ERR_FAIL_NULL(r);
 	share(r);
 }
 
diff --git a/scene/gui/rich_text_label.cpp b/scene/gui/rich_text_label.cpp
index 6f3b7d140ee..6073329e508 100644
--- a/scene/gui/rich_text_label.cpp
+++ b/scene/gui/rich_text_label.cpp
@@ -3599,7 +3599,7 @@ void RichTextLabel::pop() {
 	_stop_thread();
 	MutexLock data_lock(data_mutex);
 
-	ERR_FAIL_COND(!current->parent);
+	ERR_FAIL_NULL(current->parent);
 
 	if (current->type == ITEM_FRAME) {
 		current_frame = static_cast<ItemFrame *>(current)->parent_frame;
diff --git a/scene/gui/tab_container.cpp b/scene/gui/tab_container.cpp
index 1b148defc16..a6be8f29488 100644
--- a/scene/gui/tab_container.cpp
+++ b/scene/gui/tab_container.cpp
@@ -731,7 +731,7 @@ bool TabContainer::is_all_tabs_in_front() const {
 
 void TabContainer::set_tab_title(int p_tab, const String &p_title) {
 	Control *child = get_tab_control(p_tab);
-	ERR_FAIL_COND(!child);
+	ERR_FAIL_NULL(child);
 
 	if (tab_bar->get_tab_title(p_tab) == p_title) {
 		return;
@@ -789,7 +789,7 @@ bool TabContainer::is_tab_disabled(int p_tab) const {
 
 void TabContainer::set_tab_hidden(int p_tab, bool p_hidden) {
 	Control *child = get_tab_control(p_tab);
-	ERR_FAIL_COND(!child);
+	ERR_FAIL_NULL(child);
 
 	if (tab_bar->is_tab_hidden(p_tab) == p_hidden) {
 		return;
diff --git a/scene/gui/tree.cpp b/scene/gui/tree.cpp
index c6584eec757..a5d12aecadf 100644
--- a/scene/gui/tree.cpp
+++ b/scene/gui/tree.cpp
@@ -992,7 +992,7 @@ void TreeItem::validate_cache() const {
 void TreeItem::move_before(TreeItem *p_item) {
 	ERR_FAIL_NULL(p_item);
 	ERR_FAIL_COND(is_root);
-	ERR_FAIL_COND(!p_item->parent);
+	ERR_FAIL_NULL(p_item->parent);
 
 	if (p_item == this) {
 		return;
@@ -1037,7 +1037,7 @@ void TreeItem::move_before(TreeItem *p_item) {
 void TreeItem::move_after(TreeItem *p_item) {
 	ERR_FAIL_NULL(p_item);
 	ERR_FAIL_COND(is_root);
-	ERR_FAIL_COND(!p_item->parent);
+	ERR_FAIL_NULL(p_item->parent);
 
 	if (p_item == this) {
 		return;
@@ -1400,7 +1400,7 @@ bool TreeItem::is_folding_disabled() const {
 Size2 TreeItem::get_minimum_size(int p_column) {
 	ERR_FAIL_INDEX_V(p_column, cells.size(), Size2());
 	Tree *parent_tree = get_tree();
-	ERR_FAIL_COND_V(!parent_tree, Size2());
+	ERR_FAIL_NULL_V(parent_tree, Size2());
 
 	const TreeItem::Cell &cell = cells[p_column];
 
@@ -3916,7 +3916,7 @@ void Tree::gui_input(const Ref<InputEvent> &p_event) {
 
 bool Tree::edit_selected(bool p_force_edit) {
 	TreeItem *s = get_selected();
-	ERR_FAIL_COND_V_MSG(!s, false, "No item selected.");
+	ERR_FAIL_NULL_V_MSG(s, false, "No item selected.");
 	ensure_cursor_is_visible();
 	int col = get_selected_column();
 	ERR_FAIL_INDEX_V_MSG(col, columns.size(), false, "No item column selected.");
@@ -4338,7 +4338,7 @@ TreeItem *Tree::create_item(TreeItem *p_parent, int p_index) {
 		if (!root) {
 			// No root exists, make the given item the new root.
 			ti = memnew(TreeItem(this));
-			ERR_FAIL_COND_V(!ti, nullptr);
+			ERR_FAIL_NULL_V(ti, nullptr);
 			ti->cells.resize(columns.size());
 			ti->is_root = true;
 			root = ti;
@@ -4572,7 +4572,7 @@ TreeItem *Tree::get_selected() const {
 
 void Tree::set_selected(TreeItem *p_item, int p_column) {
 	ERR_FAIL_INDEX(p_column, columns.size());
-	ERR_FAIL_COND(!p_item);
+	ERR_FAIL_NULL(p_item);
 	select_single_item(p_item, get_root(), p_column);
 }
 
diff --git a/scene/gui/video_stream_player.cpp b/scene/gui/video_stream_player.cpp
index 1381e5be89c..19a54e01c4c 100644
--- a/scene/gui/video_stream_player.cpp
+++ b/scene/gui/video_stream_player.cpp
@@ -103,7 +103,7 @@ void VideoStreamPlayer::_mix_audio() {
 
 	if (cc == 1) {
 		AudioFrame *target = AudioServer::get_singleton()->thread_get_channel_mix_buffer(bus_index, 0);
-		ERR_FAIL_COND(!target);
+		ERR_FAIL_NULL(target);
 
 		for (int j = 0; j < buffer_size; j++) {
 			target[j] += buffer[j] * vol;
@@ -114,7 +114,7 @@ void VideoStreamPlayer::_mix_audio() {
 
 		for (int k = 0; k < cc; k++) {
 			targets[k] = AudioServer::get_singleton()->thread_get_channel_mix_buffer(bus_index, k);
-			ERR_FAIL_COND(!targets[k]);
+			ERR_FAIL_NULL(targets[k]);
 		}
 
 		for (int j = 0; j < buffer_size; j++) {
diff --git a/scene/main/canvas_item.cpp b/scene/main/canvas_item.cpp
index ae01e8b0097..f0cffa2a78b 100644
--- a/scene/main/canvas_item.cpp
+++ b/scene/main/canvas_item.cpp
@@ -381,7 +381,7 @@ void CanvasItem::update_draw_order() {
 	if (canvas_group != StringName()) {
 		get_tree()->call_group_flags(SceneTree::GROUP_CALL_UNIQUE | SceneTree::GROUP_CALL_DEFERRED, canvas_group, "_top_level_raise_self");
 	} else {
-		ERR_FAIL_COND_MSG(!get_parent_item(), "Moved child is in incorrect state (no canvas group, no canvas item parent).");
+		ERR_FAIL_NULL_MSG(get_parent_item(), "Moved child is in incorrect state (no canvas group, no canvas item parent).");
 		RenderingServer::get_singleton()->canvas_item_set_draw_index(canvas_item, get_index());
 	}
 }
@@ -1033,13 +1033,13 @@ Ref<InputEvent> CanvasItem::make_input_local(const Ref<InputEvent> &p_event) con
 
 Vector2 CanvasItem::get_global_mouse_position() const {
 	ERR_READ_THREAD_GUARD_V(Vector2());
-	ERR_FAIL_COND_V(!get_viewport(), Vector2());
+	ERR_FAIL_NULL_V(get_viewport(), Vector2());
 	return get_canvas_transform().affine_inverse().xform(get_viewport()->get_mouse_position());
 }
 
 Vector2 CanvasItem::get_local_mouse_position() const {
 	ERR_READ_THREAD_GUARD_V(Vector2());
-	ERR_FAIL_COND_V(!get_viewport(), Vector2());
+	ERR_FAIL_NULL_V(get_viewport(), Vector2());
 
 	return get_global_transform().affine_inverse().xform(get_global_mouse_position());
 }
diff --git a/scene/main/node.cpp b/scene/main/node.cpp
index a9fff264e4a..d97e6681727 100644
--- a/scene/main/node.cpp
+++ b/scene/main/node.cpp
@@ -66,8 +66,8 @@ void Node::_notification(int p_notification) {
 		} break;
 
 		case NOTIFICATION_ENTER_TREE: {
-			ERR_FAIL_COND(!get_viewport());
-			ERR_FAIL_COND(!get_tree());
+			ERR_FAIL_NULL(get_viewport());
+			ERR_FAIL_NULL(get_tree());
 
 			// Update process mode.
 			if (data.process_mode == PROCESS_MODE_INHERIT) {
@@ -121,8 +121,8 @@ void Node::_notification(int p_notification) {
 		} break;
 
 		case NOTIFICATION_EXIT_TREE: {
-			ERR_FAIL_COND(!get_viewport());
-			ERR_FAIL_COND(!get_tree());
+			ERR_FAIL_NULL(get_viewport());
+			ERR_FAIL_NULL(get_tree());
 
 			get_tree()->nodes_in_tree_count--;
 			orphan_node_count++;
@@ -1989,7 +1989,7 @@ NodePath Node::get_path_to(const Node *p_node, bool p_use_unique_path) const {
 		common_parent = common_parent->data.parent;
 	}
 
-	ERR_FAIL_COND_V(!common_parent, NodePath()); //nodes not in the same tree
+	ERR_FAIL_NULL_V(common_parent, NodePath()); //nodes not in the same tree
 
 	visited.clear();
 
@@ -2252,7 +2252,7 @@ void Node::_propagate_replace_owner(Node *p_owner, Node *p_by_owner) {
 
 Ref<Tween> Node::create_tween() {
 	ERR_THREAD_GUARD_V(Ref<Tween>());
-	ERR_FAIL_COND_V_MSG(!data.tree, nullptr, "Can't create Tween when not inside scene tree.");
+	ERR_FAIL_NULL_V_MSG(data.tree, nullptr, "Can't create Tween when not inside scene tree.");
 	Ref<Tween> tween = get_tree()->create_tween();
 	tween->bind_node(this);
 	return tween;
@@ -2437,19 +2437,19 @@ Node *Node::_duplicate(int p_flags, HashMap<const Node *, Node *> *r_duplimap) c
 		}
 #endif
 		node = res->instantiate(edit_state);
-		ERR_FAIL_COND_V(!node, nullptr);
+		ERR_FAIL_NULL_V(node, nullptr);
 		node->set_scene_instance_load_placeholder(get_scene_instance_load_placeholder());
 
 		instantiated = true;
 
 	} else {
 		Object *obj = ClassDB::instantiate(get_class());
-		ERR_FAIL_COND_V(!obj, nullptr);
+		ERR_FAIL_NULL_V(obj, nullptr);
 		node = Object::cast_to<Node>(obj);
 		if (!node) {
 			memdelete(obj);
 		}
-		ERR_FAIL_COND_V(!node, nullptr);
+		ERR_FAIL_NULL_V(node, nullptr);
 	}
 
 	if (!get_scene_file_path().is_empty()) { //an instance
diff --git a/scene/main/scene_tree.cpp b/scene/main/scene_tree.cpp
index 7c43368f961..e071011c48d 100644
--- a/scene/main/scene_tree.cpp
+++ b/scene/main/scene_tree.cpp
@@ -443,7 +443,7 @@ void SceneTree::set_group(const StringName &p_group, const String &p_name, const
 }
 
 void SceneTree::initialize() {
-	ERR_FAIL_COND(!root);
+	ERR_FAIL_NULL(root);
 	initialized = true;
 	root->_set_tree(this);
 	MainLoop::initialize();
@@ -1095,7 +1095,7 @@ bool SceneTree::ProcessGroupSort::operator()(const ProcessGroup *p_left, const P
 void SceneTree::_remove_process_group(Node *p_node) {
 	_THREAD_SAFE_METHOD_
 	ProcessGroup *pg = (ProcessGroup *)p_node->data.process_group;
-	ERR_FAIL_COND(!pg);
+	ERR_FAIL_NULL(pg);
 	ERR_FAIL_COND(pg->removed);
 	pg->removed = true;
 	pg->owner = nullptr;
@@ -1105,7 +1105,7 @@ void SceneTree::_remove_process_group(Node *p_node) {
 
 void SceneTree::_add_process_group(Node *p_node) {
 	_THREAD_SAFE_METHOD_
-	ERR_FAIL_COND(!p_node);
+	ERR_FAIL_NULL(p_node);
 
 	ProcessGroup *pg = memnew(ProcessGroup);
 
@@ -1419,7 +1419,7 @@ Error SceneTree::change_scene_to_packed(const Ref<PackedScene> &p_scene) {
 	ERR_FAIL_COND_V_MSG(p_scene.is_null(), ERR_INVALID_PARAMETER, "Can't change to a null scene. Use unload_current_scene() if you wish to unload it.");
 
 	Node *new_scene = p_scene->instantiate();
-	ERR_FAIL_COND_V(!new_scene, ERR_CANT_CREATE);
+	ERR_FAIL_NULL_V(new_scene, ERR_CANT_CREATE);
 
 	call_deferred(SNAME("_change_scene"), new_scene);
 	return OK;
@@ -1427,7 +1427,7 @@ Error SceneTree::change_scene_to_packed(const Ref<PackedScene> &p_scene) {
 
 Error SceneTree::reload_current_scene() {
 	ERR_FAIL_COND_V_MSG(!Thread::is_main_thread(), ERR_INVALID_PARAMETER, "Reloading scene can only be done from the main thread.");
-	ERR_FAIL_COND_V(!current_scene, ERR_UNCONFIGURED);
+	ERR_FAIL_NULL_V(current_scene, ERR_UNCONFIGURED);
 	String fname = current_scene->get_scene_file_path();
 	return change_scene_to_file(fname);
 }
diff --git a/scene/main/viewport.cpp b/scene/main/viewport.cpp
index 38759b85b9a..66bd60cc67f 100644
--- a/scene/main/viewport.cpp
+++ b/scene/main/viewport.cpp
@@ -2317,7 +2317,6 @@ void Viewport::_gui_force_drag(Control *p_base, const Variant &p_data, Control *
 
 void Viewport::_gui_set_drag_preview(Control *p_base, Control *p_control) {
 	ERR_FAIL_NULL(p_control);
-	ERR_FAIL_COND(!Object::cast_to<Control>((Object *)p_control));
 	ERR_FAIL_COND(p_control->is_inside_tree());
 	ERR_FAIL_COND(p_control->get_parent() != nullptr);
 
diff --git a/scene/main/window.cpp b/scene/main/window.cpp
index 3a906fd989a..b82b215e546 100644
--- a/scene/main/window.cpp
+++ b/scene/main/window.cpp
@@ -1774,7 +1774,7 @@ Rect2i Window::get_usable_parent_rect() const {
 	} else {
 		const Window *w = is_visible() ? this : get_parent_visible_window();
 		//find a parent that can contain us
-		ERR_FAIL_COND_V(!w, Rect2());
+		ERR_FAIL_NULL_V(w, Rect2());
 
 		parent_rect = DisplayServer::get_singleton()->screen_get_usable_rect(DisplayServer::get_singleton()->window_get_current_screen(w->get_window_id()));
 	}
@@ -2335,9 +2335,9 @@ Rect2i Window::get_parent_rect() const {
 	if (is_embedded()) {
 		//viewport
 		Node *n = get_parent();
-		ERR_FAIL_COND_V(!n, Rect2i());
+		ERR_FAIL_NULL_V(n, Rect2i());
 		Viewport *p = n->get_viewport();
-		ERR_FAIL_COND_V(!p, Rect2i());
+		ERR_FAIL_NULL_V(p, Rect2i());
 
 		return p->get_visible_rect();
 	} else {
diff --git a/scene/resources/importer_mesh.cpp b/scene/resources/importer_mesh.cpp
index 09738757fd4..24e8bf7ae73 100644
--- a/scene/resources/importer_mesh.cpp
+++ b/scene/resources/importer_mesh.cpp
@@ -939,7 +939,7 @@ Vector<Face3> ImporterMesh::get_faces() const {
 }
 
 Vector<Ref<Shape3D>> ImporterMesh::convex_decompose(const Ref<MeshConvexDecompositionSettings> &p_settings) const {
-	ERR_FAIL_COND_V(!Mesh::convex_decomposition_function, Vector<Ref<Shape3D>>());
+	ERR_FAIL_NULL_V(Mesh::convex_decomposition_function, Vector<Ref<Shape3D>>());
 
 	const Vector<Face3> faces = get_faces();
 	int face_count = faces.size();
@@ -1102,7 +1102,7 @@ struct EditorSceneFormatImporterMeshLightmapSurface {
 static const uint32_t custom_shift[RS::ARRAY_CUSTOM_COUNT] = { Mesh::ARRAY_FORMAT_CUSTOM0_SHIFT, Mesh::ARRAY_FORMAT_CUSTOM1_SHIFT, Mesh::ARRAY_FORMAT_CUSTOM2_SHIFT, Mesh::ARRAY_FORMAT_CUSTOM3_SHIFT };
 
 Error ImporterMesh::lightmap_unwrap_cached(const Transform3D &p_base_transform, float p_texel_size, const Vector<uint8_t> &p_src_cache, Vector<uint8_t> &r_dst_cache) {
-	ERR_FAIL_COND_V(!array_mesh_lightmap_unwrap_callback, ERR_UNCONFIGURED);
+	ERR_FAIL_NULL_V(array_mesh_lightmap_unwrap_callback, ERR_UNCONFIGURED);
 	ERR_FAIL_COND_V_MSG(blend_shapes.size() != 0, ERR_UNAVAILABLE, "Can't unwrap mesh with blend shapes.");
 
 	LocalVector<float> vertices;
diff --git a/scene/resources/mesh.cpp b/scene/resources/mesh.cpp
index 81192fa8d50..80927570273 100644
--- a/scene/resources/mesh.cpp
+++ b/scene/resources/mesh.cpp
@@ -895,7 +895,7 @@ void Mesh::clear_cache() const {
 }
 
 Vector<Ref<Shape3D>> Mesh::convex_decompose(const Ref<MeshConvexDecompositionSettings> &p_settings) const {
-	ERR_FAIL_COND_V(!convex_decomposition_function, Vector<Ref<Shape3D>>());
+	ERR_FAIL_NULL_V(convex_decomposition_function, Vector<Ref<Shape3D>>());
 
 	Ref<TriangleMesh> tm = generate_triangle_mesh();
 	ERR_FAIL_COND_V(!tm.is_valid(), Vector<Ref<Shape3D>>());
@@ -2014,7 +2014,7 @@ Error ArrayMesh::lightmap_unwrap(const Transform3D &p_base_transform, float p_te
 }
 
 Error ArrayMesh::lightmap_unwrap_cached(const Transform3D &p_base_transform, float p_texel_size, const Vector<uint8_t> &p_src_cache, Vector<uint8_t> &r_dst_cache, bool p_generate_cache) {
-	ERR_FAIL_COND_V(!array_mesh_lightmap_unwrap_callback, ERR_UNCONFIGURED);
+	ERR_FAIL_NULL_V(array_mesh_lightmap_unwrap_callback, ERR_UNCONFIGURED);
 	ERR_FAIL_COND_V_MSG(blend_shapes.size() != 0, ERR_UNAVAILABLE, "Can't unwrap mesh with blend shapes.");
 	ERR_FAIL_COND_V_MSG(p_texel_size <= 0.0f, ERR_PARAMETER_RANGE_ERROR, "Texel size must be greater than 0.");
 
diff --git a/scene/resources/packed_scene.cpp b/scene/resources/packed_scene.cpp
index 4d690bd3b1c..4686ad41966 100644
--- a/scene/resources/packed_scene.cpp
+++ b/scene/resources/packed_scene.cpp
@@ -142,7 +142,7 @@ Node *SceneState::instantiate(GenEditState p_edit_state) const {
 			Ref<PackedScene> sdata = props[base_scene_idx];
 			ERR_FAIL_COND_V(!sdata.is_valid(), nullptr);
 			node = sdata->instantiate(p_edit_state == GEN_EDIT_STATE_DISABLED ? PackedScene::GEN_EDIT_STATE_DISABLED : PackedScene::GEN_EDIT_STATE_INSTANCE); //only main gets main edit state
-			ERR_FAIL_COND_V(!node, nullptr);
+			ERR_FAIL_NULL_V(node, nullptr);
 			if (p_edit_state != GEN_EDIT_STATE_DISABLED) {
 				node->set_scene_inherited_state(sdata->get_state());
 			}
@@ -155,7 +155,7 @@ Node *SceneState::instantiate(GenEditState p_edit_state) const {
 					Ref<PackedScene> sdata = ResourceLoader::load(scene_path, "PackedScene");
 					ERR_FAIL_COND_V(!sdata.is_valid(), nullptr);
 					node = sdata->instantiate(p_edit_state == GEN_EDIT_STATE_DISABLED ? PackedScene::GEN_EDIT_STATE_DISABLED : PackedScene::GEN_EDIT_STATE_INSTANCE);
-					ERR_FAIL_COND_V(!node, nullptr);
+					ERR_FAIL_NULL_V(node, nullptr);
 				} else {
 					InstancePlaceholder *ip = memnew(InstancePlaceholder);
 					ip->set_instance_path(scene_path);
@@ -166,7 +166,7 @@ Node *SceneState::instantiate(GenEditState p_edit_state) const {
 				Ref<PackedScene> sdata = props[n.instance & FLAG_MASK];
 				ERR_FAIL_COND_V(!sdata.is_valid(), nullptr);
 				node = sdata->instantiate(p_edit_state == GEN_EDIT_STATE_DISABLED ? PackedScene::GEN_EDIT_STATE_DISABLED : PackedScene::GEN_EDIT_STATE_INSTANCE);
-				ERR_FAIL_COND_V(!node, nullptr);
+				ERR_FAIL_NULL_V(node, nullptr);
 			}
 
 		} else if (n.type == TYPE_INSTANTIATED) {
diff --git a/scene/resources/skeleton_modification_2d_physicalbones.cpp b/scene/resources/skeleton_modification_2d_physicalbones.cpp
index 818d84dffb2..520b2ce4831 100644
--- a/scene/resources/skeleton_modification_2d_physicalbones.cpp
+++ b/scene/resources/skeleton_modification_2d_physicalbones.cpp
@@ -185,7 +185,7 @@ void SkeletonModification2DPhysicalBones::set_physical_bone_chain_length(int p_l
 }
 
 void SkeletonModification2DPhysicalBones::fetch_physical_bones() {
-	ERR_FAIL_COND_MSG(!stack, "No modification stack found! Cannot fetch physical bones!");
+	ERR_FAIL_NULL_MSG(stack, "No modification stack found! Cannot fetch physical bones!");
 	ERR_FAIL_COND_MSG(!stack->skeleton, "No skeleton found! Cannot fetch physical bones!");
 
 	physical_bone_chain.clear();
diff --git a/scene/resources/texture.cpp b/scene/resources/texture.cpp
index bc084e7dbb8..b0449f0a26b 100644
--- a/scene/resources/texture.cpp
+++ b/scene/resources/texture.cpp
@@ -386,7 +386,7 @@ void PortableCompressedTexture2D::_set_data(const Vector<uint8_t> &p_data) {
 
 		} break;
 		case COMPRESSION_MODE_BASIS_UNIVERSAL: {
-			ERR_FAIL_COND(!Image::basis_universal_unpacker_ptr);
+			ERR_FAIL_NULL(Image::basis_universal_unpacker_ptr);
 			image = Image::basis_universal_unpacker_ptr(data, data_size);
 
 		} break;
@@ -812,21 +812,21 @@ void CompressedTexture2D::set_path(const String &p_path, bool p_take_over) {
 void CompressedTexture2D::_requested_3d(void *p_ud) {
 	CompressedTexture2D *ct = (CompressedTexture2D *)p_ud;
 	Ref<CompressedTexture2D> ctex(ct);
-	ERR_FAIL_COND(!request_3d_callback);
+	ERR_FAIL_NULL(request_3d_callback);
 	request_3d_callback(ctex);
 }
 
 void CompressedTexture2D::_requested_roughness(void *p_ud, const String &p_normal_path, RS::TextureDetectRoughnessChannel p_roughness_channel) {
 	CompressedTexture2D *ct = (CompressedTexture2D *)p_ud;
 	Ref<CompressedTexture2D> ctex(ct);
-	ERR_FAIL_COND(!request_roughness_callback);
+	ERR_FAIL_NULL(request_roughness_callback);
 	request_roughness_callback(ctex, p_normal_path, p_roughness_channel);
 }
 
 void CompressedTexture2D::_requested_normal(void *p_ud) {
 	CompressedTexture2D *ct = (CompressedTexture2D *)p_ud;
 	Ref<CompressedTexture2D> ctex(ct);
-	ERR_FAIL_COND(!request_normal_callback);
+	ERR_FAIL_NULL(request_normal_callback);
 	request_normal_callback(ctex);
 }
 
diff --git a/scene/resources/tile_set.cpp b/scene/resources/tile_set.cpp
index efe04ce4e1b..ec9f4806a07 100644
--- a/scene/resources/tile_set.cpp
+++ b/scene/resources/tile_set.cpp
@@ -1610,7 +1610,7 @@ Vector<Point2> TileSet::get_terrain_peering_bit_polygon(int p_terrain_set, TileS
 #define TERRAIN_ALPHA 0.6
 
 void TileSet::draw_terrains(CanvasItem *p_canvas_item, Transform2D p_transform, const TileData *p_tile_data) {
-	ERR_FAIL_COND(!p_tile_data);
+	ERR_FAIL_NULL(p_tile_data);
 
 	if (terrain_bits_meshes_dirty) {
 		// Recompute the meshes.