diff --git a/PROMS/VEPROMS.CSLA.Library/VEObjects/VETreeNode.cs b/PROMS/VEPROMS.CSLA.Library/VEObjects/VETreeNode.cs
index bc69d3ff..4e77ca73 100644
--- a/PROMS/VEPROMS.CSLA.Library/VEObjects/VETreeNode.cs
+++ b/PROMS/VEPROMS.CSLA.Library/VEObjects/VETreeNode.cs
@@ -281,6 +281,7 @@ namespace VEPROMS.CSLA.Library
 		void myItemInfo_Deleted(object sender)
 		{
 			VETreeNode parnode = Parent as VETreeNode;
+			if (parnode == null) return;
 			PartInfo pi = parnode.VEObject as PartInfo;
 			Remove();
 			// get rid of 'Steps', 'RNOs', i.e. grouping nodes, if there are no children.