Index: Ringtoets/Integration/src/Ringtoets.Integration.Data/StandAlone/SectionResults/MacrostabilityOutwardsFailureMechanismSectionResult.cs
===================================================================
diff -u -rb4816e19c7167c26fad825b88dd72b59dcedc13a -rd5dfad7e2e7b86747c393ffc9a82d774d7649a57
--- Ringtoets/Integration/src/Ringtoets.Integration.Data/StandAlone/SectionResults/MacrostabilityOutwardsFailureMechanismSectionResult.cs	(.../MacrostabilityOutwardsFailureMechanismSectionResult.cs)	(revision b4816e19c7167c26fad825b88dd72b59dcedc13a)
+++ Ringtoets/Integration/src/Ringtoets.Integration.Data/StandAlone/SectionResults/MacrostabilityOutwardsFailureMechanismSectionResult.cs	(.../MacrostabilityOutwardsFailureMechanismSectionResult.cs)	(revision d5dfad7e2e7b86747c393ffc9a82d774d7649a57)
@@ -64,7 +64,7 @@
             }
             set
             {
-                if (value < 0 || value > 1)
+                if (!double.IsNaN(value) && (value < 0 || value > 1))
                 {
                     throw new ArgumentException(Resources.ArbitraryProbabilityFailureMechanismSectionResult_AssessmentLayerTwoA_Value_needs_to_be_between_0_and_1);
                 }