diff --git a/client/online_push.go b/client/online_push.go
index 3ae81598..4f2b9d06 100644
--- a/client/online_push.go
+++ b/client/online_push.go
@@ -238,7 +238,7 @@ func msgType0x210Sub44Decoder(c *QQClient, protobuf []byte) error {
 	}
 	groupJoinLock.Lock()
 	defer groupJoinLock.Unlock()
-	if s44.GroupSyncMsg.GetGrpCode() != 0 { // member sync
+	if s44.GroupSyncMsg.GetGrpCode() == 0 { // member sync
 		return errors.New("invalid group code")
 	}
 	c.Debug("syncing members.")