“No locker” message pops up blocking checkout

All countries that have no “State/County” dropdown even though they have no Box Now set up as a shipping method, when the customer tries to complete the order via any other available method the “No locker Selected” message pops up and blocks the procedure*.
All in all Box Now is a great service with a bad woocommerce plugin. Had many problems before and still having now.
* A pretty pathetic workaround is to enable Box Now for these countries. Then the visitor tries to find a locker there, there is nothing so he/she is forced to use a different shipping method. Ideally(!!) you can add a message in the title of the method like: Box Now (not working)