form on popup on WP site

I try to use a form on a popup on a WP site. When I use the same form with the WP Mautic plugin, it works very good (http://www.ikhouvantuinieren.be/uw-vraag/). But when I use it on a exit intent popup (Icegram), the form doesn’t show. When I look at the console messages, I see “Failed to execute ‘write’ on ‘Document’: It isn’t possible to write into a document from an asynchronously-loaded external script unless it is explicitly opened.”



How can I resolve this?



Thanks for helping!

Rik

I try to use a form on a popup on a WP site. When I use the same form with the WP Mautic plugin, it works very good (http://www.ikhouvantuinieren.be/uw-vraag/). But when I use it on a exit intent popup (Icegram), the form doesn’t show. When I look at the console messages, I see “Failed to execute ‘write’ on ‘Document’: It isn’t possible to write into a document from an asynchronously-loaded external script unless it is explicitly opened.”

How can I resolve this?

Thanks for helping!
Rik