Fatal error: Uncaught Error: Call to a member function exists() on null in /var/www/vhosts/wijkhetven.nl/sites/personalinfo.wijkhetven.nl/classes/addpage.php:324
Stack trace:
#0 /var/www/vhosts/wijkhetven.nl/sites/personalinfo.wijkhetven.nl/InschrijvenActiviteitenEnergieLoket_add.php(311): AddPage->process()
#1 {main}
  thrown in /var/www/vhosts/wijkhetven.nl/sites/personalinfo.wijkhetven.nl/classes/addpage.php on line 324