Index: Ringtoets/Common/src/Ringtoets.Common.Forms/TreeNodeInfos/RingtoetsContextMenuItemFactory.cs
===================================================================
diff -u -r09c09d852a24510f1c63db1065a50ebc20471f55 -r31a41fbf921e5ef9b61fbd1e1f07ae919c8aadca
--- Ringtoets/Common/src/Ringtoets.Common.Forms/TreeNodeInfos/RingtoetsContextMenuItemFactory.cs	(.../RingtoetsContextMenuItemFactory.cs)	(revision 09c09d852a24510f1c63db1065a50ebc20471f55)
+++ Ringtoets/Common/src/Ringtoets.Common.Forms/TreeNodeInfos/RingtoetsContextMenuItemFactory.cs	(.../RingtoetsContextMenuItemFactory.cs)	(revision 31a41fbf921e5ef9b61fbd1e1f07ae919c8aadca)
@@ -377,6 +377,10 @@
         /// <returns>The created <see cref="StrictContextMenuItem"/>.</returns>
         public static StrictContextMenuItem CreateRemoveAllChildrenFromGroupItem(CalculationGroup calculationGroup, IViewCommands viewCommands)
         {
+            if (viewCommands == null)
+            {
+                throw new ArgumentNullException("viewCommands");
+            }
             var menuItem = new StrictContextMenuItem(
                 Resources.CalculationGroup_RemoveAllChildrenFromGroup_Remove_all,
                 Resources.CalculationGroup_RemoveAllChildrenFromGroup_Remove_all_Tooltip,