I have solved the problem by deaktivating the follow lines: /*…*/

Construction Field Pro: construction-field-custom.js (assets/js/construction-field-custom.js)

Line 350-352

function at_gmap_loadmap() {
var script = document.createElement(‘script’);
script.type = ‘text/javascript’;
/* script.src = ‘https://maps.googleapis.com/maps/api/js?key=’+construction_field_ajax.gmap_key+’&v=3.exp’ +
‘&signed_in=true&callback=at_gmap_map_initialize’;
document.body.appendChild(script); */
}