It’s not broken it’s just a warning I have fixed it by replacing this line in the file: /wp-content/plugins/bainternet-user-ranks/baur.class.php
Replace this line:
$r = $wpdb->get_results( $wpdb->prepare( "SELECT user_id FROM $wpdb->usermeta WHERE meta_key = 'ba_ur'"));
With this:
$r = $wpdb->get_results( $wpdb->prepare( "SELECT user_id FROM $wpdb->usermeta WHERE meta_key = 'ba_ur'", $id));
Hope this helps you.