diff --git a/IRaCIS.Core.Application/Service/TrialSiteUser/DTO/PersonalWorkstationViewModel.cs b/IRaCIS.Core.Application/Service/TrialSiteUser/DTO/PersonalWorkstationViewModel.cs
index 833bf4163..c0affbebf 100644
--- a/IRaCIS.Core.Application/Service/TrialSiteUser/DTO/PersonalWorkstationViewModel.cs
+++ b/IRaCIS.Core.Application/Service/TrialSiteUser/DTO/PersonalWorkstationViewModel.cs
@@ -280,7 +280,7 @@ namespace IRaCIS.Core.Application.Contracts
 
         public string? PM_EMail { get; set; }
 
-        public List<Guid> TrialIdList { get; set; }
+        public List<Guid> TrialIdList { get; set; }=new List<Guid>();
     }
 
     public class TrialToBeDoneDto : TrialBaseInfoDto