diff --git a/IRaCIS.Core.Application/Service/Visit/DTO/ClinicalStudySubjects.cs b/IRaCIS.Core.Application/Service/Visit/DTO/ClinicalStudySubjects.cs
index 5204678af..ca9c4357e 100644
--- a/IRaCIS.Core.Application/Service/Visit/DTO/ClinicalStudySubjects.cs
+++ b/IRaCIS.Core.Application/Service/Visit/DTO/ClinicalStudySubjects.cs
@@ -109,7 +109,7 @@ namespace IRaCIS.Application.Contracts
         public int? InPlanVisitCount { get; set; }
         public int? InPlanVisitSubmmitCount { get; set; }
 
-        public string FinalSubjectVisitName { get; set; }
+        public string? FinalSubjectVisitName { get; set; }
 
 
         public int? MissingSubmmitCount { get; set; }