[Plugin: Google Maps Builder] Warning displayed

As soon as this plugin has been activated, at the top of every page appears the error:
Warning: Invalid argument supplied for foreach() in /web/htdocs/www.match2grow.it/home/wordpress/wp-content/plugins/google-maps-builder/public/class-wordpress-google-maps.php on line 537
despite the short code is not present in any page. Activation is sufficient.
The maps appers correctly!
at the moment plugin is deactivated, so the error does not display.