diff --git a/IRaCIS.Core.Application/Service/Reading/Dto/ReadingImageTaskViewModel.cs b/IRaCIS.Core.Application/Service/Reading/Dto/ReadingImageTaskViewModel.cs
index 0fd9ed8b9..9dfacdcfe 100644
--- a/IRaCIS.Core.Application/Service/Reading/Dto/ReadingImageTaskViewModel.cs
+++ b/IRaCIS.Core.Application/Service/Reading/Dto/ReadingImageTaskViewModel.cs
@@ -600,7 +600,7 @@ namespace IRaCIS.Core.Application.Service.Reading.Dto
 
         public bool IsHighlight { get; set; } = false;
 
-        public Guid VisitTaskId { get; set; }
+        public Guid? VisitTaskId { get; set; }
     }
 
     public class ChartItem