diff --git a/IRaCIS.Core.Application/Service/Allocation/DTO/VisitTaskViewModel.cs b/IRaCIS.Core.Application/Service/Allocation/DTO/VisitTaskViewModel.cs
index 6304e014b..67fd2ebc1 100644
--- a/IRaCIS.Core.Application/Service/Allocation/DTO/VisitTaskViewModel.cs
+++ b/IRaCIS.Core.Application/Service/Allocation/DTO/VisitTaskViewModel.cs
@@ -215,7 +215,7 @@ namespace IRaCIS.Core.Application.ViewModel
 
         public Guid? RootReReadingTaskId { get; set; }
 
-        public string TaskCode { get; set; }
+        public string? TaskCode { get; set; }
     }