diff --git a/server/web3helper/controllers/bcservice.js b/server/web3helper/controllers/bcservice.js
index 1ea50de..1871f69 100644
--- a/server/web3helper/controllers/bcservice.js
+++ b/server/web3helper/controllers/bcservice.js
@@ -32,6 +32,12 @@ async function isValidAccount(session) {
 }
 
 async function presentItem(session) {
+  const {err, conn} = await app.getDbConn('MarketDb0');
+  if (err) {
+    session.rspErr(1, 'is invalid account');
+    return;
+  }
+  session.rspOk();
 }
 
 function init() {