diff --git a/webapp/controller/BattleController.class.php b/webapp/controller/BattleController.class.php
index 260cffba..9d237ed4 100644
--- a/webapp/controller/BattleController.class.php
+++ b/webapp/controller/BattleController.class.php
@@ -1122,6 +1122,7 @@ class BattleController extends BaseAuthedController {
     private function checkTicket($r, $customData, $mapModeMeta)
     {
         if ($mapModeMeta['map_mode'] == 501) {
+            error_log("checkTick error :501");
             return false;
         }
         $itemId = $mapModeMeta['admission_item_id'];