After having performed an upgrade through git from REL1_30 -> REL1_31
Special:Version page displays the following error: https://i.imgur.com/3xIRP0j.png
```
[946e1245c71e1a346e6d4c15] /wiki/index.php?title=Special:Version MediaWiki\ShellDisabledError from line 88 of /var/www/html/wiki/includes/shell/Command.php: Unable to run external programs, proc_open() is disabled
Backtrace:
#0 /var/www/html/wiki/includes/shell/CommandFactory.php(105): MediaWiki\Shell\Command->__construct()
#1 /var/www/html/wiki/includes/shell/Shell.php(128): MediaWiki\Shell\CommandFactory->create()
#2 /var/www/html/wiki/includes/GitInfo.php(240): MediaWiki\Shell\Shell::command(array)
#3 /var/www/html/wiki/includes/specials/SpecialVersion.php(349): GitInfo->getHeadCommitDate()
#4 /var/www/html/wiki/includes/specials/SpecialVersion.php(303): SpecialVersion::getVersionLinkedGit()
#5 /var/www/html/wiki/includes/specials/SpecialVersion.php(228): SpecialVersion::getVersionLinked()
#6 /var/www/html/wiki/includes/specials/SpecialVersion.php(139): SpecialVersion::softwareInformation()
#7 /var/www/html/wiki/includes/specialpage/SpecialPage.php(522): SpecialVersion->execute(NULL)
#8 /var/www/html/wiki/includes/specialpage/SpecialPageFactory.php(568): SpecialPage->run(NULL)
#9 /var/www/html/wiki/includes/MediaWiki.php(288): SpecialPageFactory::executePath(Title, RequestContext)
#10 /var/www/html/wiki/includes/MediaWiki.php(861): MediaWiki->performRequest()
#11 /var/www/html/wiki/includes/MediaWiki.php(524): MediaWiki->main()
#12 /var/www/html/wiki/index.php(42): MediaWiki->run()
#13 {main}
```
proc_open has always been disabled for security reasons and it has never been an issue before.
Downgrading back to REL1_30 fixed Special:Version