attribute_escape() inserts php Notice in settings

attribute_escape() should be changed to esc_attr() in follow-us.php. If you activate the widget while in debug mode, “Notice: attribute_escape is deprecated since version 2.8! Use esc_attr() instead. in /Users/jpresley/Sites/wordpressunified/httpdocs/wp-includes/functions.php on line 2908Follow us on” is echoed to the input fields in the widget settings.

https://www.ads-software.com/plugins/follow-us-on-widget/