diff --git a/src/server/game/message_mgr.go b/src/server/game/message_mgr.go
index 10158eed..d43ddb1c 100644
--- a/src/server/game/message_mgr.go
+++ b/src/server/game/message_mgr.go
@@ -198,7 +198,8 @@ func ClusterSyncHandler(data *msg.Msg) (interface{}, error) {
 	messageMgrData.mu.Lock()
 	TempMessageList := messageMgrData.MessageList
 	messageMgrData.MessageList = make(map[int64]*MessageList)
-	messageMgrData.mu.Unlock()
+	defer messageMgrData.mu.Unlock()
+	log.Debug("[Middleware] Cluster sync send temp message len: %d", len(TempMessageList))
 	for _, Message := range TempMessageList {
 		for _, msgItem := range Message.Messages {
 			SendMsgToCenterAsync(msgItem)