Index: trunk/src/org/openstreetmap/josm/actions/ToggleGPXLinesAction.java
===================================================================
--- trunk/src/org/openstreetmap/josm/actions/ToggleGPXLinesAction.java	(revision 1501)
+++ trunk/src/org/openstreetmap/josm/actions/ToggleGPXLinesAction.java	(revision 1502)
@@ -19,5 +19,6 @@
     public void actionPerformed(ActionEvent e) {
         Main.pref.put("draw.rawgps.lines", !Main.pref.getBoolean("draw.rawgps.lines"));
-        Main.map.mapView.repaint();
+        if(Main.map != null)
+            Main.map.mapView.repaint();
     }
 }