Error check GLTFDocumentExtensionConvertImporterMesh::import_post.

modules/gltf/gltf_document_extension_convert_importer_mesh.cpp

@@ -29,6 +29,7 @@
 /*************************************************************************/
 
 #include "gltf_document_extension_convert_importer_mesh.h"
+#include "core/error/error_macros.h"
 #include "scene/3d/mesh_instance_3d.h"
 #include "scene/resources/importer_mesh.h"
 
@@ -38,6 +39,8 @@ void GLTFDocumentExtensionConvertImporterMesh::_bind_methods() {
 }
 
 Error GLTFDocumentExtensionConvertImporterMesh::import_post(Ref<GLTFDocument> p_document, Node *p_node) {
+	ERR_FAIL_NULL_V(p_document, ERR_INVALID_PARAMETER);
+	ERR_FAIL_NULL_V(p_node, ERR_INVALID_PARAMETER);
 	List<Node *> queue;
 	queue.push_back(p_node);
 	List<Node *> delete_queue;