diff --git a/scene/2d/navigation_obstacle_2d.cpp b/scene/2d/navigation_obstacle_2d.cpp
index c5ac9b33e2a..2a8555d3621 100644
--- a/scene/2d/navigation_obstacle_2d.cpp
+++ b/scene/2d/navigation_obstacle_2d.cpp
@@ -134,7 +134,7 @@ NavigationObstacle2D::~NavigationObstacle2D() {
 }
 
 void NavigationObstacle2D::set_navigation(Navigation2D *p_nav) {
-	if (navigation == p_nav) {
+	if (navigation == p_nav && navigation != nullptr) {
 		return; // Pointless
 	}
 
diff --git a/scene/3d/navigation_obstacle.cpp b/scene/3d/navigation_obstacle.cpp
index 1376a08d521..027f803905c 100644
--- a/scene/3d/navigation_obstacle.cpp
+++ b/scene/3d/navigation_obstacle.cpp
@@ -140,7 +140,7 @@ NavigationObstacle::~NavigationObstacle() {
 }
 
 void NavigationObstacle::set_navigation(Navigation *p_nav) {
-	if (navigation == p_nav) {
+	if (navigation == p_nav && navigation != nullptr) {
 		return; // Pointless
 	}