diff --git a/IRaCIS.Core.Application/Service/Reading/ClinicalData/ClinicalAnswerService.cs b/IRaCIS.Core.Application/Service/Reading/ClinicalData/ClinicalAnswerService.cs
index 10c10b707..261ca8a12 100644
--- a/IRaCIS.Core.Application/Service/Reading/ClinicalData/ClinicalAnswerService.cs
+++ b/IRaCIS.Core.Application/Service/Reading/ClinicalData/ClinicalAnswerService.cs
@@ -358,7 +358,7 @@ namespace IRaCIS.Core.Application.Service
 				ReadingId = inDto.ReadingId,
 			};
 
-            if (await _readModuleCriterionFromRepository.AnyAsync(x => x.ClinicalFormId == inDto.ClinicalFormId?default(Guid)))
+            if (inDto.ClinicalFormId!=null&&(await _readModuleCriterionFromRepository.AnyAsync(x => x.ClinicalFormId == inDto.ClinicalFormId.Value)))
             {
                 throw new BusinessValidationFailedException("当前表单已确认,无法修改！");
             }