Fatal error: Uncaught Error: Call to undefined function add_filter() in /usr/home/bmserwer1/domains/paniburger.pl/public_html/wp-includes/default-filters.php:22
Stack trace:
#0 {main}
  thrown in /usr/home/bmserwer1/domains/paniburger.pl/public_html/wp-includes/default-filters.php on line 22