diff --git a/IRaCIS.Core.Application/Service/Reading/Dto/ReadingImageTaskViewModel.cs b/IRaCIS.Core.Application/Service/Reading/Dto/ReadingImageTaskViewModel.cs
index 13ff07419..8910fd89c 100644
--- a/IRaCIS.Core.Application/Service/Reading/Dto/ReadingImageTaskViewModel.cs
+++ b/IRaCIS.Core.Application/Service/Reading/Dto/ReadingImageTaskViewModel.cs
@@ -613,7 +613,7 @@ namespace IRaCIS.Core.Application.Service.Reading.Dto
     {
         public Guid Id { get; set; }
 
-        public string Answer { get; set; }
+        public string Answer { get; set; } = string.Empty;
     }
     public class DicomReadingQuestionAnswer : ReadingQuestionTrial
     {
@@ -1205,9 +1205,9 @@ namespace IRaCIS.Core.Application.Service.Reading.Dto
         /// </summary>
         public Guid? OtherStudyId { get; set; }
 
-        public string OtherMarkTool { get; set; }
+        public string OtherMarkTool { get; set; } = string.Empty;
 
-        public string OtherPicturePath { get; set; }
+        public string OtherPicturePath { get; set; } = string.Empty;
 
         public int? OtherNumberOfFrames { get; set; }
         public string OtherMeasureData { get; set; } = string.Empty;