diff --git a/backend/routes/tickets.js b/backend/routes/tickets.js
index ad5265c..f1b52a5 100644
--- a/backend/routes/tickets.js
+++ b/backend/routes/tickets.js
@@ -147,7 +147,8 @@ router.post('/', ticketAnonLimiter, optionalAuth, upload.array('files', 5), fina
     }
   }
   // 身份解析: 登录用户可选用自己绑定的任一身份(网易端/皮肤站); 匿名用表单值
-  let rgn = reporter_game_name, rgu = reporter_game_uid;
+  // 注: 匿名表单无 reporter_game_uid 字段(UID 已内置化), 必须兜底 '' 避免 mysql2 对 undefined 参数抛错
+  let rgn = reporter_game_name || '', rgu = reporter_game_uid || '';
   if (req.user) {
     if (reporter_game_name && reporter_game_name !== req.user.game_name) {
       const ident = await getRow('SELECT id FROM user_identities WHERE user_id = ? AND game_name = ?', [req.user.id, reporter_game_name]);