Uncaught ReferenceError: google is not defined

Hey!

I’m using your Plugin Version 6.4.03 and the map isn’t loading.
First it only doesn’t load when i clicked on the contact side, I had to reload the page and then the Map showed. I followed the documentation for when the map doesn’t show an now I get an error code in the console and I didn’t see the map, even after reload:

jquery-migrate.min.js?ver=1.4.1:2 JQMIGRATE: Migrate is installed, version 1.4.1
wpgmaps.js?ver=6.4.03b:157 Uncaught ReferenceError: google is not defined
    at wpgmaps.js?ver=6.4.03b:157
(anonymous) @ wpgmaps.js?ver=6.4.03b:157
wpgmaps.js?ver=6.4.03b:13 Uncaught ReferenceError: google is not defined
    at InitMap (wpgmaps.js?ver=6.4.03b:13)
    at HTMLDocument.<anonymous> (wpgmaps.js?ver=6.4.03b:33)
    at i (jquery.js?ver=1.12.4:2)
    at Object.fireWith [as resolveWith] (jquery.js?ver=1.12.4:2)
    at Function.ready (jquery.js?ver=1.12.4:2)
    at HTMLDocument.K (jquery.js?ver=1.12.4:2)
InitMap @ wpgmaps.js?ver=6.4.03b:13
(anonymous) @ wpgmaps.js?ver=6.4.03b:33
i @ jquery.js?ver=1.12.4:2
fireWith @ jquery.js?ver=1.12.4:2
ready @ jquery.js?ver=1.12.4:2
K @ jquery.js?ver=1.12.4:2