Index: /trunk/src/org/openstreetmap/josm/gui/dialogs/ToggleDialog.java
===================================================================
--- /trunk/src/org/openstreetmap/josm/gui/dialogs/ToggleDialog.java	(revision 10324)
+++ /trunk/src/org/openstreetmap/josm/gui/dialogs/ToggleDialog.java	(revision 10325)
@@ -439,5 +439,7 @@
     public void destroy() {
         closeDetachedDialog();
-        hideNotify();
+        if (isShowing) {
+            hideNotify();
+        }
         Main.main.menu.windowMenu.remove(windowMenuItem);
         Toolkit.getDefaultToolkit().removeAWTEventListener(this);