diff --git a/IRaCIS.Core.Application/Service/Reading/ReadingImageTask/ReadingGlobalTaskService.cs b/IRaCIS.Core.Application/Service/Reading/ReadingImageTask/ReadingGlobalTaskService.cs
index 83db23a6e..4f94fe613 100644
--- a/IRaCIS.Core.Application/Service/Reading/ReadingImageTask/ReadingGlobalTaskService.cs
+++ b/IRaCIS.Core.Application/Service/Reading/ReadingImageTask/ReadingGlobalTaskService.cs
@@ -335,7 +335,7 @@ namespace IRaCIS.Application.Services
                 {
                     var agreeOrNotAnswer = globalReadingQuestion.Where(y => y.TaskId == x.VisitTaskId && y.GlobalAnswerType == GlobalAnswerType.AgreeOrNot).Select(x => x.Answer).FirstOrDefault() ?? string.Empty;
 
-                    if (agreeOrNotAnswer.IsNullOrEmpty()&& lastGlobalTask.RelatedVisitTaskIdList.Contains(x.VisitTaskId))
+                    if (agreeOrNotAnswer.IsNullOrEmpty()&& lastGlobalTask!=null&& lastGlobalTask.RelatedVisitTaskIdList.Contains(x.VisitTaskId))
                     {
                         agreeOrNotAnswer = "1";
                     }