When I activate Google Maps I get: PHP Notice: The called

When I activate Google Maps I get:

PHP Notice: The called constructor method for WP_Widget in AgmMapsWidget is deprecated since version 4.3.0! Use

__construct()
instead. in /nas/content/live/disasterelief/wp-includes/functions.php on line 3718

The error goes away as soon as I deactivate the plugin.

I'm surprised that a company like wpmudev would have deprecated code in your plugins. Don't you run PHPUnit?