Fatal error in checkout.php line 296 – get_shipping_country() on null

We are encountering a fatal error with WooCommerce Multi Currency:

Call to a member function get_shipping_country() on null

File: /wp-content/plugins/woocommerce-multi-currency/frontend/checkout.php:296

The stack trace shows save_shipping_country() is triggered during WC_Checkout->get_checkout_fields() via the PaymentPlugins PayPal for WooCommerce plugin, and it can occur even on non-checkout pages (404 template).

It appears WC()->customer is null when the method runs. A null check around the customer object resolves the fatal error temporarily.

Please advise on the compatibility fix for the current WooCommerce versions.