I get this warning: PHP Warning: A non-numeric value encountered in /var/www/www.wijzijnkapper.nl/wp-content/plugins/woocommerce-jetpack/includes/class-wcj-price-by-user-role.php on line 530
I run WordPress 6.4.1, Woocommerce 8.3.1, Booster 7.1.3, PHP 8.1 on Ubunty with APache.
Thanks for your message. If possible you can add the below code to wp-config.php file. This will not show this kind of warning. And if still showing an error you can share the screenshot where it’s showing so, we can check and help you.