diff --git a/IRaCIS.Core.Application/Service/Reading/ReadingImageTask/ReadingImageTaskService.cs b/IRaCIS.Core.Application/Service/Reading/ReadingImageTask/ReadingImageTaskService.cs
index bf5aaddd8..2077a4def 100644
--- a/IRaCIS.Core.Application/Service/Reading/ReadingImageTask/ReadingImageTaskService.cs
+++ b/IRaCIS.Core.Application/Service/Reading/ReadingImageTask/ReadingImageTaskService.cs
@@ -342,6 +342,16 @@ namespace IRaCIS.Core.Application.Service
         [HttpPost]
         public async Task<IResponseOutput> SubmitCustomTag(ReadingCustomTagDto inDto)
         {
+
+            if (inDto.Id == null&&inDto.MarkId!=null)
+            {
+                var oldMark = await _readingTaskQuestionMarkRepository.Where(x => x.MarkId == inDto.MarkId && x.QuestionId == null).FirstOrDefaultAsync();
+                if( oldMark != null)
+                {
+                    inDto.Id = oldMark.Id;
+                }
+            }
+
             var entity = await _readingTaskQuestionMarkRepository.InsertOrUpdateAsync(inDto, true);
             return ResponseOutput.Ok(entity.Id.ToString());
         }