Index: applications/editors/josm/plugins/utilsplugin/src/UtilsPlugin/JoinAreasAction.java
===================================================================
--- applications/editors/josm/plugins/utilsplugin/src/UtilsPlugin/JoinAreasAction.java	(revision 16734)
+++ applications/editors/josm/plugins/utilsplugin/src/UtilsPlugin/JoinAreasAction.java	(revision 16735)
@@ -224,5 +224,5 @@
         // Delete the remaining inner ways
         if(innerWays != null && innerWays.size() > 0)
-            cmds.add(DeleteCommand.delete(getEditLayer(), innerWays, true));
+            cmds.add(DeleteCommand.delete(Main.map.mapView.getEditLayer(), innerWays, true));
         commitCommands(marktr("Delete Ways that are not part of an inner multipolygon"));