This error is occurring because https was used for the site and the google map is loaded over https.


To solve open server side code/ views/template.htm line 124:

<script type="text/javascript" src="http://maps.googleapis.com/maps/api/js?key={{@MAP_ACCESS_KEY}}"></script>

change to https:

<script type="text/javascript" src="https://maps.googleapis.com/maps/api/js?key={{@MAP_ACCESS_KEY}}"></script>