I see the same problem.
The latest version of the plugin causes this error sometimes on a wordpress site.
“Warning: Invalid argument supplied for foreach() in /websites/la/laregotool.com.au/r764abq/wp-content/plugins/google-maps-builder/public/class-wordpress-google-maps.php on line 537”
This did not occur on the previous version and started as soon as the new version was activated.
Any fix available yet?
Using wordpress 4.1.
thanks
Barry