diff --git a/webapp/controller/TempToolsController.class.php b/webapp/controller/TempToolsController.class.php
index 358d1ad3..da635568 100644
--- a/webapp/controller/TempToolsController.class.php
+++ b/webapp/controller/TempToolsController.class.php
@@ -393,9 +393,9 @@ class TempToolsController extends BaseController {
                 'dbname' => $mysql_conf['database'],
             ));
         }
-        $heroContractAddress = HERO_CONTRACT_ADDRESS;
+        $heroContractAddress = '\"' . HERO_CONTRACT_ADDRESS . '\"';
         if ($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<=$endTime and lower(JSON_EXTRACT(convert(return_values using utf8), '$.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;";
         }