Index: /trunk/src/org/openstreetmap/josm/actions/DownloadReferrersAction.java
===================================================================
--- /trunk/src/org/openstreetmap/josm/actions/DownloadReferrersAction.java	(revision 2270)
+++ /trunk/src/org/openstreetmap/josm/actions/DownloadReferrersAction.java	(revision 2271)
@@ -52,7 +52,9 @@
 
     public void actionPerformed(ActionEvent e) {
-        if (!isEnabled())
+        if (!isEnabled() || Main.map == null || Main.map.mapView == null)
             return;
         OsmDataLayer layer = Main.map.mapView.getEditLayer();
+        if (layer == null)
+            return;
         Collection<OsmPrimitive> primitives = layer.data.getSelected();
         downloadReferrers(primitives);