JWilliam on "[Plugin: Async JS and CSS] Error message"

Hi all!
After installing the plug in i get this error: "The Google Maps API server rejected your request. The 'sensor' parameter specified in the request must be set to either 'true' or 'false'." and the map doesn't show up.
If i disable it everything works again.
Any clue?
This the site: http://www.geottantacostruzioni.it
Tnx

https://wordpress.org/plugins/async-js-and-css/