v2.12 Critical error

Hello!
I tried to update your plugin to v2.12. I got the critical error after it.

2022-10-27T07:59:45+00:00 CRITICAL Uncaught Error: Call to a member function __unset() on null in /home/luxlessi/public_html/wp-content/plugins/klarna-payments-for-woocommerce/includes/kp-functions.php:110
Stack trace:
#0 /home/luxlessi/public_html/wp-content/plugins/klarna-payments-for-woocommerce/classes/class-wc-gateway-klarna-payments.php(133): kp_unset_session_values()
#1 /home/luxlessi/public_html/wp-content/plugins/klarna-payments-for-woocommerce/classes/class-wc-gateway-klarna-payments.php(167): WC_Gateway_Klarna_Payments->country_currency_check()
#2 /home/luxlessi/public_html/wp-content/plugins/woocommerce/includes/class-wc-payment-gateways.php(154): WC_Gateway_Klarna_Payments->is_available()
#3 /home/luxlessi/public_html/wp-content/plugins/woocommerce/src/Admin/Features/OnboardingTasks/Tasks/Payments.php(89): WC_Payment_Gateways->get_available_payment_gateways()
#4 /home/luxlessi/public_html/wp-content/plugins/woocommerce/src/Admin/Features/OnboardingTasks/Tasks/Payments.php(70): Automattic\WooCommerce\Admin\Features\OnboardingTasks\ in /home/luxlessi/public_html/wp-content/plugins/klarna-payments-for-woocommerce/includes/kp-functions.php on line 110

PHP Version 7.4.32

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