Index: Ringtoets/HeightStructures/src/Ringtoets.HeightStructures.Forms/Views/HeightStructuresFailureMechanismView.cs
===================================================================
diff -u -r83ac738ad69ef53eba6ca4f647657e5b7f024b96 -r16559315c0a64fffd05827d249200c62e353231f
--- Ringtoets/HeightStructures/src/Ringtoets.HeightStructures.Forms/Views/HeightStructuresFailureMechanismView.cs	(.../HeightStructuresFailureMechanismView.cs)	(revision 83ac738ad69ef53eba6ca4f647657e5b7f024b96)
+++ Ringtoets/HeightStructures/src/Ringtoets.HeightStructures.Forms/Views/HeightStructuresFailureMechanismView.cs	(.../HeightStructuresFailureMechanismView.cs)	(revision 16559315c0a64fffd05827d249200c62e353231f)
@@ -91,7 +91,7 @@
 
             calculationInputObserver = new RecursiveObserver<CalculationGroup, HeightStructuresInput>(
                 UpdateMapData, pcg => pcg.Children.Concat<object>(pcg.Children.OfType<StructuresCalculation<HeightStructuresInput>>()
-                                                                     .Select(pc => pc.InputParameters)).ToArray());
+                                                                     .Select(pc => pc.InputParameters)));
             calculationGroupObserver = new RecursiveObserver<CalculationGroup, CalculationGroup>(UpdateMapData, pcg => pcg.Children);
             calculationObserver = new RecursiveObserver<CalculationGroup, StructuresCalculation<HeightStructuresInput>>(UpdateMapData, pcg => pcg.Children);
             foreshoreProfileObserver = new RecursiveObserver<ForeshoreProfileCollection, ForeshoreProfile>(UpdateMapData, coll => coll);