Uncaught Error: Call to a member function get_meta() on bool

A customer using this plugin received the following error report:

Huidige plugin: PostNL for WooCommerce (versie 5.4.1)
PHP versie 8.0.30

Foutdetails
===========
Een fout van het type E_ERROR werd veroorzaakt op regelnummer 738 van het bestand wp-content/plugins/woo-postnl/src/Utils.php. Foutmelding: Uncaught Error: Call to a member function get_meta() on bool in wp-content/plugins/woo-postnl/src/Utils.php:738
Stack trace:
#0 wp-content/plugins/woo-postnl/src/Utils.php(715): PostNLWooCommerce\Utils::check_products_for_letterbox()
#1 wp-content/plugins/woo-postnl/src/Order/OrdersList.php(139): PostNLWooCommerce\Utils::is_eligible_auto_letterbox()
#2 wp-includes/class-wp-hook.php(324): PostNLWooCommerce\Order\OrdersList->add_order_delivery_date_column_content()
#3 wp-includes/class-wp-hook.php(348): WP_Hook->apply_filters()
#4 wp-includes/plugin.php(517): WP_Hook->do_action()
#5 wp-admin/includes/class-wp-posts-list-table.php(1398): do_action()
#6 wp-admin/includes/class-wp-list-table.php(1796): WP_Posts_List_Table->column_default()
#7 wp-admin/includes/class-wp-posts-list-table.php(1432): WP_List_Table->single_row_columns()
#8 wp-admin/includes/class-wp-posts-list-table.php(834): WP_Posts_List_Table->single_row()
#9 wp-admin/includes/class-wp-posts-list-table.php(810): WP_Posts_List_Table->_display_rows()
#10 wp-admin/includes/class-wp-list-table.php(1706): WP_Posts_List_Table->display_rows()
#11 wp-admin/includes/class-wp-list-table.php(1633): WP_List_Table->display_rows_or_placeholder()
#12 wp-admin/edit.php(503): WP_List_Table->display()
#13 {main}
thrown

The implementation on the following lines is not good:
https://plugins.trac.www.ads-software.com/browser/woo-postnl/tags/5.4.1/src/Utils.php#L737

foreach ( $products as $item_id => $item ) {
    $product              = wc_get_product( $item['product_id'] ?? $item->get_product_id() );
    $is_letterbox_product = $product->get_meta( Product\Single::LETTERBOX_PARCEL );

You have forgotten that wc_get_product( … ) does not necessarily always return a product, but can also return null or false.

https://woocommerce.github.io/code-reference/files/woocommerce-includes-wc-product-functions.html#function_wc_get_product

Please resolve this quickly, these are signals that the quality of this plugin is really insufficient. By using tools such as PHPStan, such issues can be easily dealt with.