diff --git a/IRaCIS.Core.Application/Service/ReadingCalculate/OCTCalculateService.cs b/IRaCIS.Core.Application/Service/ReadingCalculate/OCTCalculateService.cs
index 39b91e9cf..95e459c28 100644
--- a/IRaCIS.Core.Application/Service/ReadingCalculate/OCTCalculateService.cs
+++ b/IRaCIS.Core.Application/Service/ReadingCalculate/OCTCalculateService.cs
@@ -1263,7 +1263,7 @@ namespace IRaCIS.Core.Application.Service.ReadingCalculate
         public async Task<decimal?> GetAvgFCT(ReadingCalculateDto inDto)
         {
             return inDto.QuestionInfo.Where(x => x.LesionType == LesionType.ROI).SelectMany(x => x.TableRowInfoList).SelectMany(x => x.TableQuestionList)
-             .Where(x => x.QuestionMark == QuestionMark.AvgFCT).Select(x => x.Answer.IsNullOrEmptyReturn0()).Average();
+             .Where(x => x.QuestionMark == QuestionMark.AvgFCT).Select(x => x.Answer.IsNullOrEmptyReturn0()).DefaultIfEmpty(0).Average();
         }
 
         /// <summary>
@@ -1274,7 +1274,7 @@ namespace IRaCIS.Core.Application.Service.ReadingCalculate
         public async Task<decimal?> GetAvgLipidAngle(ReadingCalculateDto inDto)
         {
             return inDto.QuestionInfo.Where(x => x.LesionType == LesionType.ROI).SelectMany(x => x.TableRowInfoList).SelectMany(x => x.TableQuestionList)
-             .Where(x => x.QuestionMark == QuestionMark.LipidAngle).Select(x => x.Answer.IsNullOrEmptyReturn0()).Average();
+             .Where(x => x.QuestionMark == QuestionMark.LipidAngle).Select(x => x.Answer.IsNullOrEmptyReturn0()).DefaultIfEmpty(0).Average();
         }