diff --git a/editor/import/editor_scene_importer_gltf.cpp b/editor/import/editor_scene_importer_gltf.cpp
index 7de6db7add5..a418915830d 100644
--- a/editor/import/editor_scene_importer_gltf.cpp
+++ b/editor/import/editor_scene_importer_gltf.cpp
@@ -1302,6 +1302,8 @@ Error EditorSceneImporterGLTF::_parse_images(GLTFState &state, const String &p_b
 
 		if (mimetype.findn("png") != -1) {
 			//is a png
+			ERR_FAIL_COND_V(Image::_png_mem_loader_func == NULL, ERR_UNAVAILABLE);
+
 			const Ref<Image> img = Image::_png_mem_loader_func(data_ptr, data_size);
 
 			ERR_FAIL_COND_V(img.is_null(), ERR_FILE_CORRUPT);
@@ -1316,6 +1318,8 @@ Error EditorSceneImporterGLTF::_parse_images(GLTFState &state, const String &p_b
 
 		if (mimetype.findn("jpeg") != -1) {
 			//is a jpg
+			ERR_FAIL_COND_V(Image::_jpg_mem_loader_func == NULL, ERR_UNAVAILABLE);
+
 			const Ref<Image> img = Image::_jpg_mem_loader_func(data_ptr, data_size);
 
 			ERR_FAIL_COND_V(img.is_null(), ERR_FILE_CORRUPT);
diff --git a/modules/assimp/import_utils.h b/modules/assimp/import_utils.h
index f4505249db3..c522b01727d 100644
--- a/modules/assimp/import_utils.h
+++ b/modules/assimp/import_utils.h
@@ -355,11 +355,13 @@ public:
 			print_verbose("Open Asset Import: Loading embedded texture " + filename);
 			if (tex->mHeight == 0) {
 				if (tex->CheckFormat("png")) {
+					ERR_FAIL_COND_V(Image::_png_mem_loader_func == NULL, Ref<Image>());
 					Ref<Image> img = Image::_png_mem_loader_func((uint8_t *)tex->pcData, tex->mWidth);
 					ERR_FAIL_COND_V(img.is_null(), Ref<Image>());
 					state.path_to_image_cache.insert(p_path, img);
 					return img;
 				} else if (tex->CheckFormat("jpg")) {
+					ERR_FAIL_COND_V(Image::_jpg_mem_loader_func == NULL, Ref<Image>());
 					Ref<Image> img = Image::_jpg_mem_loader_func((uint8_t *)tex->pcData, tex->mWidth);
 					ERR_FAIL_COND_V(img.is_null(), Ref<Image>());
 					state.path_to_image_cache.insert(p_path, img);