diff --git a/webapp/controller/BattleController.class.php b/webapp/controller/BattleController.class.php
index 9d237ed4..e45408fd 100644
--- a/webapp/controller/BattleController.class.php
+++ b/webapp/controller/BattleController.class.php
@@ -1121,7 +1121,7 @@ class BattleController extends BaseAuthedController {
 
     private function checkTicket($r, $customData, $mapModeMeta)
     {
-        if ($mapModeMeta['map_mode'] == 501) {
+        if ($mapModeMeta['mapMode'] == 501) {
             error_log("checkTick error :501");
             return false;
         }