diff --git a/Assets/Scripts/RTGController.cs b/Assets/Scripts/RTGController.cs
index 10d75c42..49c20e5b 100644
--- a/Assets/Scripts/RTGController.cs
+++ b/Assets/Scripts/RTGController.cs
@@ -65,6 +65,7 @@ public class RTGController : UnitySingleton<RTGController>
         if (Input.GetKeyDown(KeyCode.Delete)&& !simulationUI.isplaying)
         {
             Destroy(selectedObjects[0]);
+            ClearGizmoTargetObjects();
         }
     }
     public void SetWorkGizmoId(GizmoId gizmoId)
diff --git a/Assets/WorkSpace/LH/Web/WebManager.cs b/Assets/WorkSpace/LH/Web/WebManager.cs
index 3c9c2dd2..d232d98f 100644
--- a/Assets/WorkSpace/LH/Web/WebManager.cs
+++ b/Assets/WorkSpace/LH/Web/WebManager.cs
@@ -1,4 +1,4 @@
-using Newtonsoft.Json;
+using Newtonsoft.Json;
 using System.Collections;
 using Octopus.Simulator.Networks;
 using System.Collections.Generic;
@@ -86,7 +86,14 @@ namespace UVC.Networks
 
             if ( json != null)
             {
-                data = JsonConvert.SerializeObject(json);
+                try
+                {
+                    data = JsonConvert.SerializeObject(json);
+                }
+                catch (Exception e)
+                {
+                    AlertManager.I.ShowAlert("Error",e.Message).Forget();
+                }
             }
 
             RequestAsync<T>(requestURL, type, data)