From 4067d7d30f84e8027940370d97b4104ad083f6ff Mon Sep 17 00:00:00 2001
From: Kongfa Waroros <gongpha@hotmail.com>
Date: Tue, 17 Jun 2025 19:45:53 +0700
Subject: [PATCH] Free nodes from instantiating if it is not a Control in the
 theme editor

---
 editor/plugins/theme_editor_preview.cpp | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/editor/plugins/theme_editor_preview.cpp b/editor/plugins/theme_editor_preview.cpp
index a31b766ef39..b6a3cfd81b9 100644
--- a/editor/plugins/theme_editor_preview.cpp
+++ b/editor/plugins/theme_editor_preview.cpp
@@ -510,8 +510,15 @@ bool SceneThemeEditorPreview::set_preview_scene(const String &p_path) {
 	}
 
 	Node *instance = loaded_scene->instantiate();
-	if (!instance || !Object::cast_to<Control>(instance)) {
+
+	if (!instance) {
+		EditorNode::get_singleton()->show_warning(TTR("Invalid PackedScene resource, could not instantiate it."));
+		return false;
+	}
+
+	if (!Object::cast_to<Control>(instance)) {
 		EditorNode::get_singleton()->show_warning(TTR("Invalid PackedScene resource, must have a Control node at its root."));
+		memdelete(instance);
 		return false;
 	}