Plugin not working on latest Woocommerce version

Hello,

It was working perfect before.

Now this plugin is not working anymore with Wqoocommerce, I get this error when trying to export the file:

Имаше проблем със запазването на настройките. За повече информация вижте конзолата.

Then if I look in the woocommerce log the error is this one:

2021-12-06T19:07:18+00:00 CRITICAL Uncaught TypeError: Argument 6 passed to Audit\Order::__construct() must be of the type string, null given, called in /var/www/f4foils/public_html/wp-content/plugins/bulgarisation-for-woocommerce/app/Admin/Tabs/Export_Tab.php on line 123 and defined in /var/www/f4foils/public_html/wp-content/plugins/bulgarisation-for-woocommerce/vendor/escapeboy/nra-audit-generator/lib/Order.php:31
Stack trace:
#0 /var/www/f4foils/public_html/wp-content/plugins/bulgarisation-for-woocommerce/app/Admin/Tabs/Export_Tab.php(123): Audit\Order->__construct()
#1 /var/www/f4foils/public_html/wp-content/plugins/bulgarisation-for-woocommerce/app/Admin/Tabs/Export_Tab.php(54): Woo_BG\Admin\Tabs\Export_Tab->generate_xml_file()
#2 /var/www/f4foils/public_html/wp-includes/class-wp-hook.php(303): Woo_BG\Admin\Tabs\Export_Tab->woo_bg_export_nap_callback()
#3 /var/www/f4foils/public_html/wp-includes/class-wp-hook.php(327): WP_Hook->apply_filters()
#4 /var/www/f4foils/public_html/wp-includes/plugin.php(470): WP_Hook->do_action()
#5 /var/www/f4 in /var/www/f4foils/public_html/wp-content/plugins/bulgarisation-for-woocommerce/vendor/escapeboy/nra-audit-generator/lib/Order.php on line 31