PHP Warning: Illegal string offset 'url' in tcpdf.php on line 18814

[CDCG]

Hi, after upgrading VM to 3.4.2 we get this error:

PHP Warning:  Illegal string offset 'url' in /public_html/libraries/vendor/tecnickcom/tcpdf/tcpdf.php on line 18814

VM: 3.4.2
PHP: 7.2
Joomla: 3.9.0

Thanks in advance.

[StefanSTS]

Please check GJCs post:

http://forum.virtuemart.net/index.php?topic=140816.msg495697#msg495697

Stefan