diff --git a/webapp/services/BlockChainService.php b/webapp/services/BlockChainService.php
index 85dce8ce..c68e263c 100644
--- a/webapp/services/BlockChainService.php
+++ b/webapp/services/BlockChainService.php
@@ -8,7 +8,10 @@ class BlockChainService {
     {
         if (!($actionType > Transaction::BUY_BEGIN_ACTION_TYPE &&
               $actionType < Transaction::BUY_END_ACTION_TYPE)) {
-
+            error_log('gameItemMallBuy action_type error:' . $actionType);
+            myself()->_rspErr(500,  'server internal error');
+            die();
+            return;
         }
         $params = array(
             'c' => 'GameItemMall',