diff --git a/apps/ai-game-creator-shell/src/features/ui-editor/stateTransition.ts b/apps/ai-game-creator-shell/src/features/ui-editor/stateTransition.ts
index 552e64a2b..c4338e0ca 100644
--- a/apps/ai-game-creator-shell/src/features/ui-editor/stateTransition.ts
+++ b/apps/ai-game-creator-shell/src/features/ui-editor/stateTransition.ts
@@ -117,6 +117,9 @@ export function applyUiEditorCommand(
     const status = command.patch.component_status;
     if (status !== 'NoProblem') return { ok: false, reason: 'invalid' };
   }
-  node.metadata = { ...node.metadata, ...structuredClone(command.patch) };
+  const patch = Object.fromEntries(
+    Object.entries(command.patch).filter(([, value]) => value !== undefined),
+  ) as Partial<NodeMetadata>;
+  node.metadata = { ...node.metadata, ...structuredClone(patch) };
   return { ok: true, state: next };
 }