i get this issues after checkout.

[Rajnish11]

Fatal error: Uncaught Error: Call to a member function add_to_cart() on null in C:\xampp\htdocs\Water\wp-content\plugins\pwacommerce\includes\class-pwacommerce-api.php:263 Stack trace: #0 C:\xampp\htdocs\Water\wp-includes\rest-api\class-wp-rest-server.php(946): PWAcommerce\Includes\PWAcommerce_API->checkout_redirect(Object(WP_REST_Request)) #1 C:\xampp\htdocs\Water\wp-includes\rest-api\class-wp-rest-server.php(329): WP_REST_Server->dispatch(Object(WP_REST_Request)) #2 C:\xampp\htdocs\Water\wp-includes\rest-api.php(305): WP_REST_Server->serve_request('/pwacommerce/pr...') #3 C:\xampp\htdocs\Water\wp-includes\class-wp-hook.php(288): rest_api_loaded(Object(WP)) #4 C:\xampp\htdocs\Water\wp-includes\class-wp-hook.php(312): WP_Hook->apply_filters(NULL, Array) #5 C:\xampp\htdocs\Water\wp-includes\plugin.php(544): WP_Hook->do_action(Array) #6 C:\xampp\htdocs\Water\wp-includes\class-wp.php(387): do_action_ref_array('parse_request', Array) #7 C:\xampp\htdocs\Water\wp-includes\class-wp.php(729): WP->parse_request('') #8 C:\xampp\htd in C:\xampp\htdocs\Water\wp-content\plugins\pwacommerce\includes\class-pwacommerce-api.php on line 263