diff --git a/server/web3bcspider/services/erc721_refresher.js b/server/web3bcspider/services/erc721_refresher.js
index 00313e9..55d3bbf 100644
--- a/server/web3bcspider/services/erc721_refresher.js
+++ b/server/web3bcspider/services/erc721_refresher.js
@@ -149,6 +149,10 @@ class Erc721Refresher extends BaseService {
       ],
       fields,
     );
+    const lastIdx = BigInt(row['idx']);
+    if (lastIdx > this.lastIdx) {
+      this.lastIdx = lastIdx;
+    }
   }
 
 }