Fatal error: Cannot make non static method Kufer\Web\Classes\Api\SearchRestriction\SearchRestriction::cleanFilterKriterium() static in class Kufer\Web\Classes\Api\SearchRestriction\SearchRestrictionKatKeineBegonnenFilter in /www/htdocs/w0207743/koeln.site-testing.de/public/fileadmin/kuferweb/classes/api/sucheinschraenkung/SearchRestrictionKatKeineBegonnenFilter.php on line 53