Hi,
Could you reinstall the plugin, and let me know, please?
or Simply in your copy of the plugin, specifically in the “/wp-content/plugins/codepeople-post-map/js/cpm.js” file, replace the piece of code:
script.src='https://maps.google.com/maps/api/js?sensor=false'+((typeof cpm_language != 'undefined' && cpm_language.lng) ? '&language='+cpm_language.lng: '')+'&callback=cpm_init';
with
script.src=(( typeof window.location.protocol != 'undefined' ) ? window.location.protocol : 'http:' )+'//maps.google.com/maps/api/js?callback=cpm_init'+((typeof cpm_language != 'undefined' && cpm_language.lng) ? '&language='+cpm_language.lng: '');
and then, clear the browser’s cache.
Best regards.