diff --git a/server/web3bcspider/services/erc721_refresher.js b/server/web3bcspider/services/erc721_refresher.js
index 38b24b2..0523695 100644
--- a/server/web3bcspider/services/erc721_refresher.js
+++ b/server/web3bcspider/services/erc721_refresher.js
@@ -190,7 +190,7 @@ class Erc721Refresher extends BaseService {
   }
 
   async update(row, fields) {
-    const {err} = await this.dbpool.execBcEventConn(
+    const {err} = await dbpool.execBcEventConn(
       app,
       'update',
       't_erc721_refresh',