Error on front page with maps plugin installed

Hi We're getting this error message on our front page as soon as I install this plugin:

Notice: Undefined offset: 0 in /home/content/p3pnexwpnas04_data01/11/2442011/html/wp-content/plugins/wpmu_dev_maps_plugin/inc/class-agm-map-model.php on line 1047

The actual maps in the posts don't seem to work either. They just show a blank box where the map should be.

I'm deactivating the plugin now because I can't have this message sprawled across the front page. Please get in contact and we can arrange a time when the site is less busy so we can re-enable it and you can take a look.

Thanks