Hi,
We are aware of this recent change introduced by Google Maps. This “callback” in the URL parameters is now mandatory, but the point is that on the 99% of the WordPress websites, this would actually fail to be called, and other, different, JavaScript errors would be raised. What you see in the console is actually a log raised by Google, but invoking a function during a callback when this function is not ready yet (maybe due to lazy-loading techniques of JS assets) would mean generating a real JavaScript error that may harm the rest of the website.
Our programmers will analyse the situation better, because Vik Booking does not need Google Maps to invoke a callback to render the actual map. It was definitely better if this param was left optional by Google, and this may change again in a near update for Google Maps.