Index: applications/editors/josm/plugins/openstreetbugs/src/org/openstreetmap/josm/plugins/osb/OsbPlugin.java
===================================================================
--- applications/editors/josm/plugins/openstreetbugs/src/org/openstreetmap/josm/plugins/osb/OsbPlugin.java	(revision 29372)
+++ applications/editors/josm/plugins/openstreetbugs/src/org/openstreetmap/josm/plugins/osb/OsbPlugin.java	(revision 29373)
@@ -166,5 +166,7 @@
             SwingUtilities.invokeLater(new Runnable() {
                 public void run() {
-                    dialog.setEnabled(false);
+                    if (dialog != null) {
+                        dialog.setEnabled(false);
+                    }
                 }
             });