PHP Fatal error: Uncaught Error: Call to undefined function wc_empty_cart()

Flexible Shipping plugin version: 4.11.3
Current plugin: WooCommerce (version 6.3.0)
PHP version 7.4.25

Error Details
=============
An error of type E_ERROR was caused in line 372 of the file /www/user/public/web/app/plugins/woocommerce/includes/class-wc-session-handler.php. Error message: Uncaught Error: Call to undefined function wc_empty_cart() in /www/user/public/web/app/plugins/woocommerce/includes/class-wc-session-handler.php:372
Stack trace:
#0 /www/user/public/web/app/plugins/woocommerce/includes/class-wc-session-handler.php(363): WC_Session_Handler->forget_session()
#1 /www/user/public/web/app/plugins/woocommerce/includes/class-wc-session-handler.php(99): WC_Session_Handler->destroy_session()
#2 /www/user/public/web/app/plugins/woocommerce/includes/class-wc-session-handler.php(71): WC_Session_Handler->init_session_cookie()
#3 /www/user/public/web/app/plugins/woocommerce/includes/class-woocommerce.php(825): WC_Session_Handler->init()
#4 /www/user/public/web/app/plugins/woocommerce-dpd-uk/classes/class-woocommerce-dpd-uk.php(81): WooCommerce->initialize_session()
#5 /www/user/public/web/wp/wp-includes/class-wp-hook.php(307): WPDesk_WooCommerce_DPD_UK->init_services_verifier('')

The problem is that we are unaware of what action triggers the error (we couldn’t recreate the error ourselves).

Could you support me with the error, please?

Regards,
Sadie