diff --git a/IRaCIS.Core.Application/Service/Reading/ReadingImageTask/ReadingImageTaskService.cs b/IRaCIS.Core.Application/Service/Reading/ReadingImageTask/ReadingImageTaskService.cs
index b307dfa25..034a6bcd7 100644
--- a/IRaCIS.Core.Application/Service/Reading/ReadingImageTask/ReadingImageTaskService.cs
+++ b/IRaCIS.Core.Application/Service/Reading/ReadingImageTask/ReadingImageTaskService.cs
@@ -109,7 +109,11 @@ namespace IRaCIS.Core.Application.Service
             List<ReadingReportAndImageCriterion> imageCriteriaList = new List<ReadingReportAndImageCriterion>();
         
 
-            var trialReadingCriterionList = taskList.Select(x => x.TrialReadingCriterion).Distinct().ToList();
+            var trialReadingCriterionList = taskList
+               .Select(x => x.TrialReadingCriterion)
+               .GroupBy(x => x.Id)
+               .Select(g => g.First())
+               .ToList(); ;
 
             foreach (var criterion in trialReadingCriterionList)
             {