Internal error

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[bdf715195f908c453eaf3046] /index.php?title=Generalized_Phrase_Structure_Grammar&oldid=4208 Error from line 1573 of /var/lib/mediawiki/includes/page/Article.php: Call to a member function getTimestamp() on null

Backtrace:

#0 /var/lib/mediawiki/includes/page/Article.php(711): Article->setOldSubtitle()
#1 /var/lib/mediawiki/includes/actions/ViewAction.php(63): Article->view()
#2 /var/lib/mediawiki/includes/MediaWiki.php(511): ViewAction->show()
#3 /var/lib/mediawiki/includes/MediaWiki.php(302): MediaWiki->performAction()
#4 /var/lib/mediawiki/includes/MediaWiki.php(900): MediaWiki->performRequest()
#5 /var/lib/mediawiki/includes/MediaWiki.php(527): MediaWiki->main()
#6 /var/lib/mediawiki/index.php(46): MediaWiki->run()
#7 {main}