Appearence->Widgets critical error

Navigating to the Appearence->Widgets page in the admin panel gives a critical error:
“There has been a critical error on this website. Please check your site admin email inbox for instructions.”

Stack trace:

An error of type E_ERROR was caused in line 1328 of the file /home/xxx/domains/xxx.com/public_html/wp-content/plugins/woo-fly-cart/wpc-fly-cart.php. Error message: Uncaught Error: Call to a member function get_cart_contents_count() on null in /home/xxx/domains/xxx.com/public_html/wp-content/plugins/woo-fly-cart/wpc-fly-cart.php:1328
Stack trace:
#0 /home/xxx/domains/xxx.com/public_html/wp-content/plugins/woo-fly-cart/wpc-fly-cart.php(1382): WPCleverWoofc->woofc_get_cart_menu()
#1 /home/xxx/domains/xxx.com/public_html/wp-includes/class-wp-hook.php(303): WPCleverWoofc->woofc_nav_menu_items('

WordPress version 5.8.1
Current theme: ScapeShot (version 1.0.6)
Current plugin: WPC Fly Cart for WooCommerce (version 4.1.7)
PHP version 7.4.24

The page I need help with: [log in to see the link]