diff --git a/internal/msggateway/init.go b/internal/msggateway/init.go
index 24af9d433..808abf817 100644
--- a/internal/msggateway/init.go
+++ b/internal/msggateway/init.go
@@ -24,6 +24,9 @@ func RunWsAndServer(rpcPort, wsPort, prometheusPort int) error {
 	}
 	hubServer := NewServer(rpcPort)
 	go hubServer.Start()
+	if hubServer.Notification() == nil {
+		panic("notification is nil")
+	}
 	longServer.SetMessageHandler(hubServer.Notification())
 	hubServer.SetLongConnServer(longServer)
 	go hubServer.LongConnServer.Run()
diff --git a/internal/msggateway/n_ws_server.go b/internal/msggateway/n_ws_server.go
index d0964b3fd..24bfa213b 100644
--- a/internal/msggateway/n_ws_server.go
+++ b/internal/msggateway/n_ws_server.go
@@ -3,6 +3,7 @@ package msggateway
 import (
 	"errors"
 	"fmt"
+	"github.com/OpenIMSDK/Open-IM-Server/pkg/common/log"
 	"github.com/OpenIMSDK/Open-IM-Server/pkg/common/tokenverify"
 	"github.com/OpenIMSDK/Open-IM-Server/pkg/errs"
 	"github.com/OpenIMSDK/Open-IM-Server/pkg/rpcclient/notification"
@@ -51,6 +52,7 @@ type WsServer struct {
 }
 
 func (ws *WsServer) SetMessageHandler(rpcClient *notification.Check) {
+	log.ZDebug(nil, "msggateway SetMessageHandler", "rpcClient", rpcClient)
 	ws.MessageHandler = NewGrpcHandler(ws.validate, rpcClient)
 }