diff --git a/src/services/editor.service.ts b/src/services/editor.service.ts
index 5f2e2da..6dc423b 100644
--- a/src/services/editor.service.ts
+++ b/src/services/editor.service.ts
@@ -80,7 +80,8 @@ export class EditorService extends Meta2d {
     detail?: Partial<GroupSceneDetail>,
     isImport = false,
   ): Promise<void> {
-    const scene: StandardScene = (isString(map) ? (map ? JSON.parse(map) : {}) : map) || {};
+    const sceneData = (isString(map) ? (map ? JSON.parse(map) : {}) : map);
+    const scene: StandardScene = sceneData || {};
     if (!isEmpty(detail?.group)) {
       scene.robotGroups = [detail.group];
       scene.robots = detail.robots;