diff --git a/IRaCIS.Core.Application/Service/ReadingCalculate/MRIPDFFCalculateService.cs b/IRaCIS.Core.Application/Service/ReadingCalculate/MRIPDFFCalculateService.cs
index f0414d1cc..2096a0ddd 100644
--- a/IRaCIS.Core.Application/Service/ReadingCalculate/MRIPDFFCalculateService.cs
+++ b/IRaCIS.Core.Application/Service/ReadingCalculate/MRIPDFFCalculateService.cs
@@ -732,7 +732,7 @@ namespace IRaCIS.Core.Application.Service.ReadingCalculate
             try
             {
                 List<QuestionMark?> questionMarkList = new List<QuestionMark?>() { QuestionMark.FirstMeasurement, QuestionMark.SecondMeasurement, QuestionMark.ThirdMeasurement };
-                var measuredValueList = rowInfo.SelectMany(x => x.TableQuestionList).Where(x => questionMarkList.Contains(x.QuestionMark)).Select(x => decimal.Parse(x.Answer)).ToList();
+                var measuredValueList = rowInfo.SelectMany(x => x.TableQuestionList).Where(x =>x.Answer.IsNotNullOrEmpty()&& questionMarkList.Contains(x.QuestionMark)).Select(x => decimal.Parse(x.Answer)).ToList();
                 if (measuredValueList.Any(x => x > 100))
                 {
                     throw new BusinessValidationFailedException(_localizer["MRIPDFF_MeasurementGT100"]);