diff --git a/webapp/controller/TempToolsController.class.php b/webapp/controller/TempToolsController.class.php
index 5928e5fb..358d1ad3 100644
--- a/webapp/controller/TempToolsController.class.php
+++ b/webapp/controller/TempToolsController.class.php
@@ -395,7 +395,7 @@ class TempToolsController extends BaseController {
         }
         $heroContractAddress = HERO_CONTRACT_ADDRESS;
         if ($type == 0) {
-            $sql = "select lock_to, count(idx) as lock_count from t_nft_lock_event where createtime>=$beginTime and createtime<=$endTime and JSON_EXTRACT(convert(return_values using utf8), '$.nft')='$heroContractAddress' group by lock_to;";
+            $sql = "select lock_to, count(idx) as lock_count from t_nft_lock_event where createtime>=$beginTime and createtime<=$endTime and JSON_EXTRACT(convert(return_values using utf8), '$.nft')='\"$heroContractAddress\"' group by lock_to;";
         } else {
             $sql = "select lock_to, count(idx) as lock_count from t_nft_lock_event where createtime>=$beginTime and createtime<=$endTime group by lock_to;";
         }