Index: Ringtoets/Common/src/Ringtoets.Common.Forms/TreeNodeInfos/RingtoetsContextMenuItemFactory.cs
===================================================================
diff -u -rebc2733b5176e63f1ef9cc21aa0c8c041e6b889b -r74277dcba6c041b998442f6342f844e519686719
--- Ringtoets/Common/src/Ringtoets.Common.Forms/TreeNodeInfos/RingtoetsContextMenuItemFactory.cs	(.../RingtoetsContextMenuItemFactory.cs)	(revision ebc2733b5176e63f1ef9cc21aa0c8c041e6b889b)
+++ Ringtoets/Common/src/Ringtoets.Common.Forms/TreeNodeInfos/RingtoetsContextMenuItemFactory.cs	(.../RingtoetsContextMenuItemFactory.cs)	(revision 74277dcba6c041b998442f6342f844e519686719)
@@ -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,