修改bug

codegit/CallCenterApi/CallCenterApi.Interface/CallCenterApi.Interface/Controllers/Base/BaseController.cs

         {
             get
             {
-                return (FormsPrincipal<Cache.Models.CurrentUserInfo>)base.User;
+                try
+                {
+                    return (FormsPrincipal<Cache.Models.CurrentUserInfo>)base.User;
+                }
+                catch
+                {
+                    return null;
+                }
             }
         }
         /// <summary>