Error when checking option to add Quit to Taskbar

Fixes #11290

gramps/gui/configure.py

@@ -1137,7 +1137,7 @@ class GrampsPreferences(ConfigureDialog):
         self.dbstate.db.name_formats = _nd.get_name_format(only_custom=True,
                                                            only_active=False)
 
-    def cb_grampletbar_close(self, obj, state):
+    def cb_grampletbar_close(self, obj):
         """
         Gramplet bar close button preference callback
         """

gramps/gui/widgets/grampletbar.py

@@ -403,7 +403,8 @@ class GrampletBar(Gtk.Notebook):
         """
         for gramplet in self.get_children():
             tablabel = self.get_tab_label(gramplet)
-            tablabel.use_close(config.get('interface.grampletbar-close'))
+            if not isinstance(tablabel, Gtk.Label):
+                tablabel.use_close(config.get('interface.grampletbar-close'))
 
     def __delete_clicked(self, button, gramplet):
         """