diff --git a/IRaCIS.Core.Application/Service/ImageAndDoc/DTO/DownloadAndUploadDTO.cs b/IRaCIS.Core.Application/Service/ImageAndDoc/DTO/DownloadAndUploadDTO.cs
index 1ff61ed04..40e97d11b 100644
--- a/IRaCIS.Core.Application/Service/ImageAndDoc/DTO/DownloadAndUploadDTO.cs
+++ b/IRaCIS.Core.Application/Service/ImageAndDoc/DTO/DownloadAndUploadDTO.cs
@@ -86,7 +86,7 @@ namespace IRaCIS.Core.Application.Service.ImageAndDoc.DTO
 
 
 
-        public List<DicomStudyBasicInfo> DicomStudyList { get; set; }
+        public List<DicomStudyBasicInfo> DicomStudyList { get; set; }=new List<DicomStudyBasicInfo>();
 
         public List<NoneDicomStudyBasicInfo> NoneDicomStudyList { get; set; }
     }