diff --git a/IRaCIS.Core.Application/Service/TrialSiteUser/DTO/TrialConfigDTO.cs b/IRaCIS.Core.Application/Service/TrialSiteUser/DTO/TrialConfigDTO.cs
index 3bdb1e9c5..52d5a5894 100644
--- a/IRaCIS.Core.Application/Service/TrialSiteUser/DTO/TrialConfigDTO.cs
+++ b/IRaCIS.Core.Application/Service/TrialSiteUser/DTO/TrialConfigDTO.cs
@@ -333,7 +333,7 @@ namespace IRaCIS.Core.Application.Contracts
         public UserTypeEnum? PDProgressDefaultUserType { get; set; }
 
 
-        public object OtherObj { get; set; }
+        public object? OtherObj { get; set; }
     }
 
     public class TrialStateChangeDTO