Getting This Error After Running WP_DEBUG…

[05-Aug-2016 23:12:45 UTC] PHP Notice: The called constructor method for WP_Widget in Xyz_Insert_Html_Widget is <strong>deprecated</strong> since version 4.3.0! Use <pre>__construct()</pre> instead. in /home/wp_urnhvf/vanndigital.com/wp-includes/functions.php on line 3718

Any help will be appreciated.

https://www.ads-software.com/plugins/insert-html-snippet/