Fatal Error on Checkout Page

Hi there

The versions 2.x of your plugin throws this fatal error on the checkout page (?wc-ajax=checkout).

Fatal error: Uncaught Error: Call to a member function getId() on null in /wp-content/plugins/woo-payrexx-gateway/src/Model/PaymentMethod/Abstract/Base.php:103

Stack trace:
#0 /wp-content/plugins/woo-payrexx-gateway/src/Model/PaymentMethod/Abstract/Base.php(94): WC_Payrexx_Gateway_Base->process_redirect(NULL, Object(WC_Order))

#1 /wp-content/plugins/woo-payrexx-gateway/src/Model/PaymentMethod/Abstract/SubscriptionBase.php(88): WC_Payrexx_Gateway_Base->process_payment(2185)

#2 /wp-content/plugins/woocommerce/includes/class-wc-checkout.php(1050): WC_Payrexx_Gateway_SubscriptionBase->process_payment(2185)

#3 /wp-content/plugins/woocommerce/includes/class-wc-checkout.php(1279): WC_Checkout->process_order_payment(2185, 'payrexx')

#4 /wp-content/plugins/woocommerce/includes/class-wc-ajax.php(507): WC_Checkout->process_checkout()

#5 /wp-includes/class-wp-hook.php(308): WC_AJAX::checkout('')

#6 /wp-includes/class-wp-hook.php(332): WP_Hook->apply_filters('', Array)

#7 /wp-includes/plugin.php(517): WP_Hook->do_action(Array)

#8 /wp-content/plugins/woocommerce/includes/class-wc-ajax.php(96): do_action('wc_ajax_checkou...')

#9 /wp-includes/class-wp-hook.php(308): WC_AJAX::do_wc_ajax('')

#10 /wp-includes/class-wp-hook.php(332): WP_Hook->apply_filters(false, Array)

#11 /wp-includes/plugin.php(517): WP_Hook->do_action(Array)

#12 /wp-includes/template-loader.php(13): do_action('template_redire...')

#13 /wp-blog-header.php(19): require_once('...')

#14 /index.php(17): require('...')

#15 {main} thrown in /wp-content/plugins/woo-payrexx-gateway/src/Model/PaymentMethod/Abstract/Base.php on line 103

Version 1.9.10 is the latest version which works for us.

WordPress: 6.2.2
WooCommerce: 7.8.0
PHP 8.1.20

Steps to reproduce:
Add some stuff to the cart.
Go to checkout.
Fill address information.
Select Payrexx as payment option.
Accept terms and conditions.
Open Chrome dev tools, select network tab.
Click order now button.
See the latest response entry in dev tools..

Is there any solution to this?

Thanks in?advance and kind regards