Fatal error: Uncaught Error: Call to undefined function add_filter() in /home/antenaserwis/public_html/satserwis/wp-content/themes/twentynineteen/inc/icon-functions.php:52
Stack trace:
#0 {main}
thrown in /home/antenaserwis/public_html/satserwis/wp-content/themes/twentynineteen/inc/icon-functions.php on line 52