[Hosting] Cannot redeclare wp_get_server_protocol while running backups

When running backups on my host the backup shows 0 posts/pages/themes/plugins. After enabling debugging, there’s following fatal error in the logs:

[24-Feb-2020 10:19:32 UTC] PHP Fatal error: Cannot redeclare wp_get_server_protocol() (previously declared in /var/web/site/public_html/wp-includes/load.php:16) in /var/web/site/public_html/wp-includes/load.php on line 21