Can't generate PDF file

[Barcellos]

Frontend: blank page

Apache Error log:

PHP Notice: Uninitialized string offset: 5 in .../libraries/fabrik/vendor/dompdf/dompdf/src/Css/Stylesheet.php on line 764, referer: https://.../form/61/6

PHP Fatal error: Cannot redeclare class JDocumentRendererHead in .../libraries/joomla/document/html/renderer/head.php on line 21, referer: https:.../form/61/6​

System Information:
Joomla 3.7.5
Fabrik 3.7 updated form github 5 minutes ago
SLES 12

Can it be related to PHP version 5.5.14?

 

[Barcellos]

It works in PHP 7.
But unfortunately I still can't have PHP 7 on Production :/

 

[troester]

should be working with php5.6

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