Index: /applications/editors/josm/plugins/utilsplugin2/src/org/openstreetmap/josm/plugins/utilsplugin2/latlon/LatLonAction.java
===================================================================
--- /applications/editors/josm/plugins/utilsplugin2/src/org/openstreetmap/josm/plugins/utilsplugin2/latlon/LatLonAction.java	(revision 34914)
+++ /applications/editors/josm/plugins/utilsplugin2/src/org/openstreetmap/josm/plugins/utilsplugin2/latlon/LatLonAction.java	(revision 34915)
@@ -83,6 +83,8 @@
             cmds.add(new AddCommand(ds, wnew));
         }
-        UndoRedoHandler.getInstance().add(new SequenceCommand(tr("Lat Lon tool"), cmds));
-        MainApplication.getMap().mapView.repaint();
+        if (!cmds.isEmpty()) {
+            UndoRedoHandler.getInstance().add(new SequenceCommand(tr("Lat Lon tool"), cmds));
+            MainApplication.getMap().mapView.repaint();
+        }
     }