Fatal error after upgrading to last version (with fix)

Hi!

After upgrading to the last version of the plugin we’ve experienced fatal errors when accessing the backend, with the following backtrace:

Uncaught Error: Call to a member function get_cart() on null in /var/www/wp-content/plugins/afterpay-gateway-for-woocommerce/class/WC_Gateway_Afterpay.php:826
Stack trace:
#0 /var/www/wp-content/plugins/afterpay-gateway-for-woocommerce/class/WC_Gateway_Afterpay.php(2515): WC_Gateway_Afterpay->cart_products_are_supported()
#1 /var/www/wp-content/plugins/afterpay-gateway-for-woocommerce/class/WC_Gateway_Afterpay_Blocks_Support.php(70): WC_Gateway_Afterpay->get_cart_placement_attributes()
#2 /var/www/wp-content/plugins/woocommerce/packages/woocommerce-blocks/src/Payments/PaymentMethodRegistry.php(62): WC_Gateway_Afterpay_Blocks_Support->get_payment_method_data()
#3 /var/www/wp-content/plugins/woocommerce/packages/woocommerce-blocks/src/Payments/Api.php(92): Automattic\WooCommerce\Blocks\Payments\PaymentMethodRegistry->get_all_registered_script_data()
#4 /var/www/wp-includes/class-wp-hook.php(324): Automattic\WooCommerce\Blocks\Payments\Api->add_payment_method_script_data('')
#5 /var/www/wp-includes/class-wp-hook.php(348): WP_Hook->apply_filters('', Array)
#6 /var/www/wp-includes/plugin.php(517): WP_Hook->do_action(Array)
#7 /var/www/wp-content/plugins/woocommerce/packages/woocommerce-blocks/src/BlockTypes/MiniCart.php(201): do_action('woocommerce_blo...')
#8 /var/www/wp-content/plugins/woocommerce/packages/woocommerce-blocks/src/BlockTypes/AbstractBlock.php(100): Automattic\WooCommerce\Blocks\BlockTypes\MiniCart->enqueue_data()
#9 /var/www/wp-includes/class-wp-hook.php(324): Automattic\WooCommerce\Blocks\BlockTypes\AbstractBlock->enqueue_editor_assets('')
#10 /var/www/wp-includes/class-wp-hook.php(348): WP_Hook->apply_filters(NULL, Array)
#11 /var/www/wp-includes/plugin.php(517): WP_Hook->do_action(Array)
#12 /var/www/wp-admin/edit-form-blocks.php(272): do_action('enqueue_block_e...')
#13 /var/www/wp-admin/post.php(187): require('/var/www/...')
#14 {main}
  thrown in /var/www/wp-content/plugins/afterpay-gateway-for-woocommerce/class/WC_Gateway_Afterpay.php on line 826

I’ve fixed this problem by replacing, in WC_Afterpay_Gateway.php, the line 825 from:

if (did_action('wp_loaded')) {

To:

if (did_action('wp_loaded') && WC()->cart)) {

Please consider releasing a new version with this patch.