Fatal error: Uncaught Mpdf\MpdfException: WriteHTML() requires $html be an integer, float, string, boolean or an object with the __toString() magic method. in /homepages/36/d618311920/htdocs/bvpi.de-2.0/static/plugins/mpdf-8.0.2.0/vendor/mpdf/mpdf/src/Mpdf.php:12950 Stack trace: #0 /homepages/36/d618311920/htdocs/bvpi.de-2.0/static/scripts/mpdf.php(56): Mpdf\Mpdf->WriteHTML(NULL) #1 {main} thrown in /homepages/36/d618311920/htdocs/bvpi.de-2.0/static/plugins/mpdf-8.0.2.0/vendor/mpdf/mpdf/src/Mpdf.php on line 12950