Internal error

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[1ef2f96ce4b7be1928eea8eb] /wiki/dictionary/index.php?title=Special:Book&bookcmd=render_article&arttitle=Gas+cylinder&returnto=Gas+cylinder&oldid=957&writer=rl Error: Class 'Revision' not found

Backtrace:

from /home/iala/wikis/dictionary-1.37.1/extensions/Collection/Collection.body.php(1283)
#0 /home/iala/wikis/dictionary-1.37.1/extensions/Collection/Collection.body.php(247): SpecialCollection->makeCollection()
#1 /home/iala/wikis/dictionary-1.37.1/includes/specialpage/SpecialPage.php(647): SpecialCollection->execute()
#2 /home/iala/wikis/dictionary-1.37.1/includes/specialpage/SpecialPageFactory.php(1366): SpecialPage->run()
#3 /home/iala/wikis/dictionary-1.37.1/includes/MediaWiki.php(314): MediaWiki\SpecialPage\SpecialPageFactory->executePath()
#4 /home/iala/wikis/dictionary-1.37.1/includes/MediaWiki.php(930): MediaWiki->performRequest()
#5 /home/iala/wikis/dictionary-1.37.1/includes/MediaWiki.php(564): MediaWiki->main()
#6 /home/iala/wikis/dictionary-1.37.1/index.php(53): MediaWiki->run()
#7 /home/iala/wikis/dictionary-1.37.1/index.php(46): wfIndexMain()
#8 {main}