Blank page with RVM Map

Hi there,
I love this plugin and I use it with success in other web sites, but in a new site the plugin doesn’t work properly.
I’ve put the map in contact page with the shortcode provided by the plugin and when I load the page for the first time I see the map correctly but if I go in another page and I return for the second time in contact page I see a blank page.

here you can see the error: https://prnt.sc/fsv1el

How can I solve it?
Thank you for your support.