diff --git a/IRaCIS.Core.Application/Service/Visit/SubjectVisitService.cs b/IRaCIS.Core.Application/Service/Visit/SubjectVisitService.cs
index 67a57d78e..f8d80e7d0 100644
--- a/IRaCIS.Core.Application/Service/Visit/SubjectVisitService.cs
+++ b/IRaCIS.Core.Application/Service/Visit/SubjectVisitService.cs
@@ -437,7 +437,7 @@ namespace IRaCIS.Core.Application.Services
         /// <param name="indto"></param>
         /// <returns></returns>
         [HttpPost]
-        public async Task<VisitStudyDTO?> GetKeySeries(GetReadingVisitStudyListIndto indto)
+        public async Task<VisitStudyDTO> GetKeySeries(GetReadingVisitStudyListIndto indto)
         {
             var rowInfoList = await _readingTableAnswerRowInfoRepository.Where(x => x.VisitTaskId == indto.VisitTaskId && x.StudyId != null).OrderBy(x => x.ReadingQuestionTrial.ShowOrder).ThenBy(x => x.RowIndex).Select(x => new StudyInstanceInfo()
             {
@@ -542,7 +542,7 @@ namespace IRaCIS.Core.Application.Services
                 }
             }
 
-            return null;
+            return new VisitStudyDTO() { StudyId= default(Guid) };
         }
 
         /// <summary>
@@ -664,19 +664,21 @@ namespace IRaCIS.Core.Application.Services
                     {
                         studyList.Insert(0, keySeries);
                     }
-
-                 
+                   
 
 
 
-                    studyList.ForEach(x =>
-                    {
-                        x.SeriesList.ForEach(y =>
+
+
+
+                        studyList.ForEach(x =>
                         {
-                            y.IsBeMark = rowInfoList.Any(z => z.SeriesId == y.Id);
-                        });
+                            x.SeriesList.ForEach(y =>
+                            {
+                                y.IsBeMark = rowInfoList.Any(z => z.SeriesId == y.Id);
+                            });
 
-                    });
+                        });
                 }
 
 
@@ -745,7 +747,7 @@ namespace IRaCIS.Core.Application.Services
 
 
 
-            var result = studyList.Where(x => x.SeriesCount > 0).ToList();
+            var result = studyList.Where(x => x.SeriesCount > 0||x.StudyId== default(Guid)).ToList();
 
             return result;