Index: applications/editors/josm/plugins/merge-overlap/src/mergeoverlap/MergeOverlapAction.java
===================================================================
--- applications/editors/josm/plugins/merge-overlap/src/mergeoverlap/MergeOverlapAction.java	(revision 36132)
+++ applications/editors/josm/plugins/merge-overlap/src/mergeoverlap/MergeOverlapAction.java	(revision 36134)
@@ -225,5 +225,8 @@
         }
         if (!del.isEmpty()) {
-            cmds.add(DeleteCommand.delete(del));
+            final Command deleteCommand = DeleteCommand.delete(del);
+            if (deleteCommand != null) {
+                cmds.add(deleteCommand);
+            }
         }