diff --git a/WebStarter/Controllers/CarController.cs b/WebStarter/Controllers/CarController.cs
index 4ceacbb..6752523 100644
--- a/WebStarter/Controllers/CarController.cs
+++ b/WebStarter/Controllers/CarController.cs
@@ -1,4 +1,5 @@
-using HybirdFrameworkDriver.Session;
+using HybirdFrameworkCore.Utils;
+using HybirdFrameworkDriver.Session;
 using log4net;
 using Microsoft.AspNetCore.Mvc;
 using Newtonsoft.Json;
@@ -29,19 +30,25 @@ public class CarController : ControllerBase{
         CarInfoResp carInfoResp = new CarInfoResp()
         {
             Connected = CarServerMgr.CarServer != null && ioSession != null,
+            CarNo = carNo
         };
 
-        ioSession.BusinessMap.TryGetValue("ElecMsg", out var elecMsg);
-        if (elecMsg != null)
+        if (ObjUtils.IsNotNull(ioSession))
         {
-            carInfoResp.ElecMsg = (ElecMsg)elecMsg;
-        }
+            ioSession.BusinessMap.TryGetValue("ElecMsg", out var elecMsg);
+            if (elecMsg != null)
+            {
+                carInfoResp.ElecMsg = (ElecMsg)elecMsg;
+            }
 
-        ioSession.BusinessMap.TryGetValue("HeartBeatMsg", out var heartBeatMsg);
-        if (heartBeatMsg != null)
-        {
-            carInfoResp.HeartBeatMsg = (HeartBeatMsg)heartBeatMsg;
+            ioSession.BusinessMap.TryGetValue("HeartBeatMsg", out var heartBeatMsg);
+            if (heartBeatMsg != null)
+            {
+                carInfoResp.HeartBeatMsg = (HeartBeatMsg)heartBeatMsg;
+            }
         }
+
+
         return carInfoResp;
     }