Error thrown when opening block editor

The following error is thrown when trying to open the block editor for a post on my self-hosted wordpress site:

Error Details
=============
An error of type E_ERROR was caused in line 1306 of the file /<site root directory>/www/wordpress/wp-content/plugins/woo-paypal-gateway/ppcp/public/class-ppcp-paypal-checkout-for-woocommerce-button-manager.php. Error message: Uncaught TypeError: method_exists(): Argument #1 ($object_or_class) must be of type object|string, null given in /<site root directory>/www/wordpress/wp-content/plugins/woo-paypal-gateway/ppcp/public/class-ppcp-paypal-checkout-for-woocommerce-button-manager.php:1306
Stack trace:
#0 /<site root directory>/www/wordpress/wp-content/plugins/woo-paypal-gateway/ppcp/public/class-ppcp-paypal-checkout-for-woocommerce-button-manager.php(1306): method_exists(NULL, 'needs_shipping')
#1 /<site root directory>/www/wordpress/wp-includes/class-wp-hook.php(324): PPCP_Paypal_Checkout_For_Woocommerce_Button_Manager->filter_default_address_fields(Array)
#2 /<site root directory>/www/wordpress/wp-includes/plugin.php(205): WP_Hook->apply_filters(Array, Array)
#3 /<site root directory>/www/wordpress/wp-content/plugins/woocommerce/includes/class-wc-countries.php(823): apply_filters('woocommerce_def...', Array)
#4 /<site root directory>/www/wordpress/wp-content/plugins/woocommerce/includes/class-wc-countries.php(1672): WC_Countries->get_default_address_fields()
#5 /<site root directory>/www/wordpress/wp-content/plugins/woocommerce/src/Blocks/Utils/CartCheckoutUtils.php(346): WC_Countries->get_country_locale()
#6 /<site root directory>/www/wordpress/wp-content/plugins/woocommerce/src/Blocks/BlockTypes/Cart.php(237): Automattic\WooCommerce\Blocks\Utils\CartCheckoutUtils::get_country_data()
#7 /<site root directory>/www/wordpress/wp-content/plugins/woocommerce/src/Blocks/BlockTypes/AbstractBlock.php(111): Automattic\WooCommerce\Blocks\BlockTypes\Cart->enqueue_data()
#8 /<site root directory>/www/wordpress/wp-includes/class-wp-hook.php(324): Automattic\WooCommerce\Blocks\BlockTypes\AbstractBlock->enqueue_editor_assets('')
#9 /<site root directory>/www/wordpress/wp-includes/class-wp-hook.php(348): WP_Hook->apply_filters(NULL, Array)
#10 /<site root directory>/www/wordpress/wp-includes/plugin.php(517): WP_Hook->do_action(Array)
#11 /<site root directory>/www/wordpress/wp-admin/edit-form-blocks.php(339): do_action('enqueue_block_e...')
#12 /<site root directory>/www/wordpress/wp-admin/post.php(187): require('/...')
#13 {main}
  thrown
 

Looking at the line of code, it seems like the woocommerce card is null when the code expects it to not be null:

if (method_exists(WC()->cart, 'needs_shipping') && !WC()->cart->needs_shipping()) {

I’m not sure if the problem is that this code just needs to check if the cart is null, or if the problem is that the cart should not be null in this case. Or maybe it’s an entirely different problem (e.g. maybe this code shouldn’t be run when loading the block editor in the first place).

Any help debugging the issue is appreciated. 🙇