Hi,
Glad I could help in any way. I’m using:
PHP 7.2.7 (cli) (built: Jun 20 2018 08:21:26) ( NTS )
Copyright (c) 1997-2018 The PHP Group
Zend Engine v3.2.0, Copyright (c) 1998-2018 Zend Technologies
with Zend OPcache v7.2.7, Copyright (c) 1999-2018, by Zend Technologies
Anyway, based on what you posted the server is returning internal server error. Not sure why is this not shown in the log, but take a look at this thread, looks like the same issue.