diff --git a/Service/Car/Handler/ElecMsgHandler.cs b/Service/Car/Handler/ElecMsgHandler.cs
index b3741e2..8840539 100644
--- a/Service/Car/Handler/ElecMsgHandler.cs
+++ b/Service/Car/Handler/ElecMsgHandler.cs
@@ -26,7 +26,7 @@ public class ElecMsgHandler : SimpleChannelInboundHandler<ElecMsg>, IBaseHandler
     protected override void ChannelRead0(IChannelHandlerContext ctx, ElecMsg msg)
     {
         Log.Info($"receive ElecMsg = {JsonConvert.SerializeObject(msg)}");
-        IoSession? ioSession = SessionMgr.GetSession(msg.CarNo);
+        IoSession? ioSession =  CarServerMgr.CarServer?.SessionMgr.GetSession(msg.CarNo);
 
         ioSession?.BusinessMap.AddOrUpdate("ElecMsg", msg, ((s, o) => msg));
         ioSession?.BusinessMap.AddOrUpdate("Connected", true, ((s, o) => true));
diff --git a/Service/Car/Handler/HeartBeatMsgHandler.cs b/Service/Car/Handler/HeartBeatMsgHandler.cs
index 1bcdb63..8032951 100644
--- a/Service/Car/Handler/HeartBeatMsgHandler.cs
+++ b/Service/Car/Handler/HeartBeatMsgHandler.cs
@@ -28,7 +28,7 @@ public class HeartBeatMsgHandler : SimpleChannelInboundHandler<HeartBeatMsg>, IB
     {
 
         Log.Info($"receive HeartBeatMsg = {JsonConvert.SerializeObject(msg)}");
-        IoSession? ioSession = SessionMgr.GetSession(ctx.Channel.Id.ToString());
+        IoSession? ioSession =  CarServerMgr.CarServer?.SessionMgr.GetSession(ctx.Channel.Id.ToString());
         if (ioSession != null && ioSession.Key != msg.CarNo)
         {
             CarServerMgr.CarServer?.SessionMgr.ChangeSessionKey(ioSession, msg.CarNo);