Changing color on Rogue Theme causes error

This is NOT reproducible. I've had this happen on sites and always ignore it since the changes get saved. I'm reporting it because it might scare users and trigger support issues.

Changing from green to yellow produced one of the never-ending warnings ...
* user warning: Duplicate entry 'admin/build/menu-customize/%/add' for key 1 query: INSERT INTO menu_router (path, load_functions, to_arg_functions, access_callback, access_arguments, page_callback, page_arguments, fit, number_parts, tab_parent, tab_root, title, title_callback, title_arguments, type, block_callback, description, position, weight, file) VALUES ('admin/build/menu-customize/%/add', 'a:1:{i:3;s:9:\"menu_load\";}', '', 'user_access', 'a:1:{i:0;s:15:\"administer menu\";}', 'drupal_get_form', 'a:4:{i:0;s:14:\"menu_edit_item\";i:1;s:3:\"add\";i:2;N;i:3;i:3;}', 29, 5, 'admin/build/menu-customize/%', 'admin/build/menu-customize/%', 'Add item', 't', '', 128, '', '', '', 0, 'modules/menu/menu.admin.inc') in /home/developer/watershednow/drupal/includes/menu.inc on line 2457.