diff --git a/asg_form/Controllers/Teamregistration/RegisterController.cs b/asg_form/Controllers/Teamregistration/RegisterController.cs
index 6f13fb6..8a14f9b 100644
--- a/asg_form/Controllers/Teamregistration/RegisterController.cs
+++ b/asg_form/Controllers/Teamregistration/RegisterController.cs
@@ -26,14 +26,14 @@ namespace asg_form.Controllers.Teamregistration
     }
     public class userMsg
     {
-        public long id { get; set; }
+        public long? id { get; set; }
         public string chinaname { get; set; }
         public int userId { get; set; }
         public int sex { get; set; }
         public string introduction { get; set; }
         public string gameId { get; set; }
-        public string historyRank { get; set; }
-        public string contactNumber { get; set; }
+        public string? historyRank { get; set; }
+        public string? contactNumber { get; set; }
         
     }
     public class RegisterController : ControllerBase