Crashes widget WooCommerce: Productcategories

Hey guys

I get the following warning on my WooCommerce:Productcategories widget, especially if I enable, hide empty categories, the widget doesn’t work anymore.

Warning: Creating default object from empty value in /wordpress/wp-content/plugins/woocommerce-geolocation-based-products/includes/class-wc-geolocation-based-products-frontend.php

Any ideas what causes this error?

Thank you in advance for your help!