diff --git a/IRaCIS.Core.Domain/Allocation/VisitTask.cs b/IRaCIS.Core.Domain/Allocation/VisitTask.cs
index d6998f29e..f90bc0e71 100644
--- a/IRaCIS.Core.Domain/Allocation/VisitTask.cs
+++ b/IRaCIS.Core.Domain/Allocation/VisitTask.cs
@@ -294,7 +294,7 @@ namespace IRaCIS.Core.Domain.Models
         /// </summary>
         public bool IsConvertedTask { get; set; } = false;
 
-        public Guid BeforeConvertedTaskId { get; set; }
+        public Guid? BeforeConvertedTaskId { get; set; }
 
         [NotMapped]
         public List<CrterionDictionaryGroup> CrterionDictionaryGroup