Index: src/org/openstreetmap/josm/plugins/JunctionChecker/JunctionCheckerMapMode.java
===================================================================
--- src/org/openstreetmap/josm/plugins/JunctionChecker/JunctionCheckerMapMode.java	(revision 34950)
+++ src/org/openstreetmap/josm/plugins/JunctionChecker/JunctionCheckerMapMode.java	(working copy)
@@ -48,6 +48,7 @@
         super.exitMode();
         MainApplication.getMap().mapView.removeMouseListener(this);
         MainApplication.getMap().mapView.removeMouseMotionListener(this);
+        MainApplication.getLayerManager().removeActiveLayerChangeListener(this);
     }
 
     @Override