From dccbc65fc98e3227ebb5e03f90bdeb7e5ca1ade2 Mon Sep 17 00:00:00 2001
From: Kovid Goyal <kovid@kovidgoyal.net>
Date: Mon, 17 Jan 2011 21:50:00 -0700
Subject: [PATCH] ...

---
 src/calibre/gui2/preferences/plugins.py | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/calibre/gui2/preferences/plugins.py b/src/calibre/gui2/preferences/plugins.py
index c53c634ab4..b00a485566 100644
--- a/src/calibre/gui2/preferences/plugins.py
+++ b/src/calibre/gui2/preferences/plugins.py
@@ -196,6 +196,12 @@ class ConfigWidget(ConfigWidgetBase, Ui_Form):
     def modify_plugin(self, op=''):
         index = self.plugin_view.currentIndex()
         if index.isValid():
+            if not index.parent().isValid():
+                name = unicode(index.data().toString())
+                return error_dialog(self, _('Error'), '<p>'+
+                        _('Select an actual plugin under <b>%s</b> to customize')%name,
+                        show=True, show_copy_button=False)
+
             plugin = self._plugin_model.index_to_plugin(index)
             if op == 'toggle':
                 if not plugin.can_be_disabled: