diff --git a/src/ion.ts b/src/ion.ts
index ffe2992f..68f265c3 100644
--- a/src/ion.ts
+++ b/src/ion.ts
@@ -89,9 +89,6 @@ export class IonConnector {
     this._biz = new BizClient(url);
 
     this._biz.on('join-reply', async (success: boolean, reason: string) => {
-      if (this.onjoin) {
-        this.onjoin(success, reason);
-      }
       if (success && !this._sfu) {
         const signal = new IonSFUGRPCWebSignal(url);
         const sfu = new Client(signal, config);
@@ -104,6 +101,9 @@ export class IonConnector {
 
         await sfu.join(this._sid, this._uid);
       }
+      if (this.onjoin) {
+        this.onjoin(success, reason);
+      }
     });
 
     this._biz.on('leave-reply', (reason: string) => {