Can not load upfront editor in a page with google maps

Hi,
I can not load the upfront editor for the page /contact of my website.
http://new.marcelodena.com/contact/

For the rest of the pages (where there's no google map), the upfront editor loads withou any problem.

I had a similar problem with this and the solutions was to disable API Google Maps from the Ubermenu plugin:
https://premium.wpmudev.org/forums/topic/can-not-to-edit-a-page-with-upfront#post-995357

but in this case I have not installed the ubermenu plugin, so I don't know how to solve. Could you please help me ?

Thanks,
Marcel Odena