[Hummingbird Pro] PHP Compatibility Issue with Hummingbirg

We are showing a PHP issue with Hummingbird:

FILE: /home/wester90/public_html/ReeferContainerPros.com/wp-content/plugins/wp-hummingbird/core/modules/class-advanced.php


FOUND 1 ERROR AFFECTING 1 LINE


530 | ERROR | Extension 'mysql_' is deprecated since PHP 5.5 and removed since PHP 7.0; Use mysqli instead