diff --git a/IRaCIS.Core.Application/Service/Visit/DTO/HospitalGroupViewModel.cs b/IRaCIS.Core.Application/Service/Visit/DTO/HospitalGroupViewModel.cs
index 9ff651f2e..1ef4fb034 100644
--- a/IRaCIS.Core.Application/Service/Visit/DTO/HospitalGroupViewModel.cs
+++ b/IRaCIS.Core.Application/Service/Visit/DTO/HospitalGroupViewModel.cs
@@ -39,7 +39,7 @@ public class HospitalGroupAddOrEdit
 
     public string CallingAE { get; set; }
 
-    public List<Guid> IdentityUserIdList { get; set; }
+    public List<Guid> IdentityUserIdList { get; set; } = new List<Guid>();
 }