diff --git a/apps/ai-game-creator-shell/src/view/project-development/export/state/xhsMinitoolApi.ts b/apps/ai-game-creator-shell/src/view/project-development/export/state/xhsMinitoolApi.ts
index f4d97c9e3..5a95878e1 100644
--- a/apps/ai-game-creator-shell/src/view/project-development/export/state/xhsMinitoolApi.ts
+++ b/apps/ai-game-creator-shell/src/view/project-development/export/state/xhsMinitoolApi.ts
@@ -146,6 +146,9 @@ async function guardStructuredFailure<T, Payload>(
     // 非对象同理（命令没注册、参数序列化失败时 Tauri 会拒绝一个裸字符串）：装进 wrapper 只会
     // 得到一份没有 `type` 的假变体，调用方按变体分流时会走到不该到的分支。
     if (typeof error !== 'object' || error === null) throw error;
+    // 非对象之外，还要确认它长得像生成的判别联合：缺字符串 `type` 的普通对象装进 wrapper 只会变成
+    // 「没有任何变体」的失败，分流落到 default，真正的拒绝原因反而被当成业务现场糊过去。
+    if (typeof (error as { type?: unknown }).type !== 'string') throw error;
     throw new FailureClass(error as Payload);
   }
 }