diff --git a/IRaCIS.Core.Application/Service/ImageAndDoc/DTO/DicomSeriesModel.cs b/IRaCIS.Core.Application/Service/ImageAndDoc/DTO/DicomSeriesModel.cs
index c47c42da3..159da3d4e 100644
--- a/IRaCIS.Core.Application/Service/ImageAndDoc/DTO/DicomSeriesModel.cs
+++ b/IRaCIS.Core.Application/Service/ImageAndDoc/DTO/DicomSeriesModel.cs
@@ -81,7 +81,7 @@ namespace IRaCIS.Core.Application.Contracts.Dicom.DTO
 
         public Guid? StudyId { get; set; }
 
-        public List<int?> KeyFramesList{ get; set; }
+        public List<int?> KeyFramesList{ get; set; }=new List<int?> { };
 
         public Guid? SeriesId { get; set; }