[Plugin: Dropdown Menu Widget] WP_Admin_bar::add node issue

Notice: WP_Admin_Bar: add_node incorrectly called. ID menu should not be empty. Please refer to the test failures in WordPress for more information. (This message was added in version 3.3.) In …public_html / wp-includes / functions.php on line 3578

This pops out after update WP to 3.3.

Plugi in ver.: 1.8
WP: 3.3

http://wordpress.org/extend/plugins/dropdown-menu-widget/