This form used to work: https://hej-support.org/subscription-chemicals-in-products-newsletter/
Now it gives back a Fatal error: Cannot redeclare _PEAR_call_destructors() (previously declared in /kunden/549141_85221/webseiten/wordpress/wp-content/plugins/civicrm/civicrm/packages/PEAR.php:773) in /kunden/549141_85221/webseiten/wordpress/wp-content/plugins/backwpup/vendor/pear/pear-core-minimal/src/PEAR.php on line 812