diff --git a/IRaCIS.Core.Application/Service/Reading/ReadingImageTask/ReadingImageTaskService.cs b/IRaCIS.Core.Application/Service/Reading/ReadingImageTask/ReadingImageTaskService.cs
index 8a22002ca..80331ff54 100644
--- a/IRaCIS.Core.Application/Service/Reading/ReadingImageTask/ReadingImageTaskService.cs
+++ b/IRaCIS.Core.Application/Service/Reading/ReadingImageTask/ReadingImageTaskService.cs
@@ -354,7 +354,14 @@ namespace IRaCIS.Core.Application.Service
         [HttpPost("{id:guid}")]
         public async Task<IResponseOutput> DeleteCustomTag(Guid id)
         {
+
+            if (await _readingTaskQuestionMarkRepository.AnyAsync(t => (t.Id == id || t.MarkId == id) && t.QuestionId != null))
+            {
+                throw new BusinessValidationFailedException(_localizer["ReadingCustomTag_CannotDelete"]);
+            }
+
             var success = await _readingTaskQuestionMarkRepository.DeleteFromQueryAsync(t => t.Id == id||t.MarkId==id, true);
+
             return ResponseOutput.Ok();
         }