diff --git a/IRaCIS.Core.Application/Service/ReadingCalculate/LuganoCalculateService.cs b/IRaCIS.Core.Application/Service/ReadingCalculate/LuganoCalculateService.cs
index 7a178bd51..3c40540ca 100644
--- a/IRaCIS.Core.Application/Service/ReadingCalculate/LuganoCalculateService.cs
+++ b/IRaCIS.Core.Application/Service/ReadingCalculate/LuganoCalculateService.cs
@@ -2474,6 +2474,10 @@ namespace IRaCIS.Core.Application.Service.ReadingCalculate
             var baseLineTaskId = await GetBaseLineTaskId(inDto);
 
             var PET5PS = inDto.QuestionInfo.Where(x => x.QuestionType == QuestionType.PET5PS).Select(x => x.Answer).FirstOrDefault().IsNullOrEmptyReturn0();
+            if (PET5PS == 0)
+            {
+                return string.Empty;
+            }
             var baseLinePET5PS = (await _readingTaskQuestionAnswerRepository.Where(x => x.VisitTaskId == baseLineTaskId && x.ReadingQuestionTrial.QuestionType == QuestionType.PET5PS).Select(x => x.Answer).FirstOrDefaultAsync()).IsNullOrEmptyReturn0();