diff --git a/webapp/services/callback/GameItemMallBuyOk.php b/webapp/services/callback/GameItemMallBuyOk.php
index 4d1f1c6f..a13805c6 100644
--- a/webapp/services/callback/GameItemMallBuyOk.php
+++ b/webapp/services/callback/GameItemMallBuyOk.php
@@ -23,6 +23,7 @@ class GameItemMallBuyOk {
     public function process()
     {
         SignatureService::web3ServiceCheck();
+        $transId = getReqVal('trans_id', '');
         $orderId = getReqVal('order_id', '');
 
         error_log("GameItemMallBuyOk-------------------");