New node will be added to root node if nothing is selected

tools/editor/scene_tree_dock.cpp

@@ -1059,14 +1059,15 @@ void SceneTreeDock::_create() {
 
 
 		if (edited_scene) {
-
+			// If root exists in edited scene
 			parent = scene_tree->get_selected();
-			ERR_FAIL_COND(!parent);
-		} else {
+			if( !parent )
+				parent = edited_scene;
 
+		} else {
+			// If no root exist in edited scene
 			parent = scene_root;
 			ERR_FAIL_COND(!parent);
-
 		}
 
 		Object *c = create_dialog->instance_selected();