Viewing certain pages on the wiki I get the following backtrace: [de56350818345e7fbbe6a9e0] /wiki/MediaWiki:Common.css MWUnknownContentModelException from line 306 of /tera/tera/WebRoot/w/includes/content/ContentHandler.php: The content model '' is not registered on this wiki. See https://www.mediawiki.org/wiki/Content_handlers to find out which extensions handle this content model. Backtrace: #0 /tera/tera/WebRoot/w/includes/Storage/RevisionStore.php(930): ContentHandler::getForModelID(string) #1 /tera/tera/WebRoot/w/includes/Storage/RevisionStore.php(865): MediaWiki\Storage\RevisionStore->loadSlotContent(MediaWiki\Storage\SlotRecord, NULL, NULL, string, integer) #2 [internal function]: MediaWiki\Storage\RevisionStore->MediaWiki\Storage\{closure}(MediaWiki\Storage\SlotRecord) #3 /tera/tera/WebRoot/w/includes/Storage/SlotRecord.php(308): call_user_func(Closure, MediaWiki\Storage\SlotRecord) #4 /tera/tera/WebRoot/w/includes/Storage/RevisionRecord.php(173): MediaWiki\Storage\SlotRecord->getContent() #5 /tera/tera/WebRoot/w/includes/Revision.php(937): MediaWiki\Storage\RevisionRecord->getContent(string, integer, NULL) #6 /tera/tera/WebRoot/w/includes/parser/Parser.php(3639): Revision->getContent() #7 /tera/tera/WebRoot/w/includes/parser/Parser.php(3551): Parser->statelessFetchTemplate(Title, Parser) #8 /tera/tera/WebRoot/w/includes/parser/Parser.php(3485): Parser->fetchTemplateAndTitle(Title) #9 /tera/tera/WebRoot/w/includes/parser/Parser.php(3243): Parser->getTemplateDom(Title) #10 /tera/tera/WebRoot/w/includes/parser/Preprocessor_DOM.php(1277): Parser->braceSubstitution(array, PPFrame_DOM) #11 /tera/tera/WebRoot/w/includes/parser/Parser.php(2942): PPFrame_DOM->expand(DOMElement, integer) #12 /tera/tera/WebRoot/w/includes/parser/Parser.php(1293): Parser->replaceVariables(string) #13 /tera/tera/WebRoot/w/includes/parser/Parser.php(443): Parser->internalParse(string) #14 /tera/tera/WebRoot/w/extensions/SyntaxHighlight_GeSHi/includes/SyntaxHighlight.php(459): Parser->parse(string, Title, ParserOptions, boolean, boolean, integer) #15 /tera/tera/WebRoot/w/includes/Hooks.php(177): SyntaxHighlight::onContentGetParserOutput(CssContent, Title, integer, ParserOptions, boolean, ParserOutput) #16 /tera/tera/WebRoot/w/includes/Hooks.php(205): Hooks::callHook(string, array, array, NULL) #17 /tera/tera/WebRoot/w/includes/content/AbstractContent.php(510): Hooks::run(string, array) #18 /tera/tera/WebRoot/w/includes/poolcounter/PoolWorkArticleView.php(144): AbstractContent->getParserOutput(Title, integer, ParserOptions) #19 /tera/tera/WebRoot/w/includes/poolcounter/PoolCounterWork.php(123): PoolWorkArticleView->doWork() #20 /tera/tera/WebRoot/w/includes/page/Article.php(604): PoolCounterWork->execute() #21 /tera/tera/WebRoot/w/includes/actions/ViewAction.php(68): Article->view() #22 /tera/tera/WebRoot/w/includes/MediaWiki.php(500): ViewAction->show() #23 /tera/tera/WebRoot/w/includes/MediaWiki.php(294): MediaWiki->performAction(Article, Title) #24 /tera/tera/WebRoot/w/includes/MediaWiki.php(861): MediaWiki->performRequest() #25 /tera/tera/WebRoot/w/includes/MediaWiki.php(524): MediaWiki->main() #26 /tera/tera/WebRoot/w/index.php(42): MediaWiki->run() #27 {main} I did run the update.php script without errors. I am stumped as to what is causing this. Configuration: MW 1.31.0 PHP 7.1.18 MariaDB 10.2.14 ICU 60.2