Index: Ringtoets/Integration/src/Ringtoets.Integration.Plugin/RingtoetsGuiPlugin.cs
===================================================================
diff -u -rd1c60b79a5add63479f44fdbdbbd16d3593949dd -r64d5609bb2912cd52dc74deffdd189222e240599
--- Ringtoets/Integration/src/Ringtoets.Integration.Plugin/RingtoetsGuiPlugin.cs	(.../RingtoetsGuiPlugin.cs)	(revision d1c60b79a5add63479f44fdbdbbd16d3593949dd)
+++ Ringtoets/Integration/src/Ringtoets.Integration.Plugin/RingtoetsGuiPlugin.cs	(.../RingtoetsGuiPlugin.cs)	(revision 64d5609bb2912cd52dc74deffdd189222e240599)
@@ -308,7 +308,10 @@
             var failureMechanismContext = o as IFailureMechanismContext<IFailureMechanism>;
             if (assessmentSection != null)
             {
-                return assessmentSection.GetFailureMechanisms().Any(fm => ReferenceEquals(view.Data, ((FailureMechanismBase<FailureMechanismSectionResult>) fm).SectionResults));
+                return assessmentSection
+                    .GetFailureMechanisms()
+                    .OfType<FailureMechanismBase<FailureMechanismSectionResult>>()
+                    .Any(fm => ReferenceEquals(view.Data,fm.SectionResults));
             }
             if (failureMechanismContext != null)
             {