CRITICAL Uncaught Error: Call to a member function getId() on null

Hello, we are getting trouble when we want to make a payment with Zahls plugin on Woocommerce.

WordPress: 6.1.1
Woocommerce: 7.3.0
Zahls plugin: 1.2.3

Here is the log from woocommerce:

2023-01-20T08:38:35+00:00 CRITICAL Uncaught Error: Call to a member function getId() on null in /home/clients/25e9020c0157d5f1d992abf41d99653e/sites/dbjewelry.ch/wp-content/plugins/zahls-ch-payment-gateway/woo-zahls-gateway.php:258 Stack trace: #0 /home/clients/25e9020c0157d5f1d992abf41d99653e/sites/dbjewelry.ch/wp-content/plugins/woocommerce/includes/class-wc-checkout.php(1050): WC_Zahls_Gateway->process_payment(29467) #1 /home/clients/25e9020c0157d5f1d992abf41d99653e/sites/dbjewelry.ch/wp-content/plugins/woocommerce/includes/class-wc-checkout.php(1279): WC_Checkout->process_order_payment(29467, 'zahls') #2 /home/clients/25e9020c0157d5f1d992abf41d99653e/sites/dbjewelry.ch/wp-content/plugins/woocommerce/includes/class-wc-ajax.php(481): WC_Checkout->process_checkout() #3 /home/clients/25e9020c0157d5f1d992abf41d99653e/sites/dbjewelry.ch/wp-includes/class-wp-hook.php(308): WC_AJAX::checkout('') #4 /home/clients/25e9020c0157d5f1d992abf41d99653e/sites/dbjewelry.ch/wp-includes/class-wp-hook.php(332): WP_Hook->apply_filters('', Array) #5 /home/client dans /home/clients/25e9020c0157d5f1d992abf41d99653e/sites/dbjewelry.ch/wp-content/plugins/zahls-ch-payment-gateway/woo-zahls-gateway.php à la ligne 258

Hope that help.

Thank you