Warning error

Thanks for fixing the fatal error on activation issue – I managed to get the plugin working!

Now I have this issue:

Warning: unserialize() expects parameter 1 to be string, array given in (…)/wp-content/plugins/woocomerce-price-by-country/woocommerce-price-by-country.php on line 972

Any ideas?

https://wordpress.org/plugins/woocomerce-price-by-country/