Fatal error: Uncaught Error: Call to a member function add_panel() on null in /home/oho09/public_html/lekcjatestdm/wp-content/themes/sydney/inc/customizer/options/header.php:11 Stack trace: #0 {main} thrown in /home/oho09/public_html/lekcjatestdm/wp-content/themes/sydney/inc/customizer/options/header.php on line 11