When installing mediawiki/extensions/AkismetKlik it seems to work fine but loading a page ends up with a trace:
/index.php?title=0.7827181411311182-%C3%B6%C3%A4%C3%BC-%E2%99%A0%E2%99%A3%E2%99%A5%E2%99%A6&action=submit MWException from line 43 of /home/hashar/projects/integration/quibble/workspace/src/extensions/AkismetKlik/AkismetKlik_body.php: Set $wgAKkey in LocalSettings.php or relevant configuration file. #1 includes/Hooks.php(174): AkismetKlik::onAkismetFilterMergedContent(RequestContext, WikitextContent, Status, string, User, boolean) #2 includes/Hooks.php(202): Hooks::callHook(string, array, array, NULL) #3 includes/EditPage.php(1673): Hooks::run(string, array) #4 includes/EditPage.php(1992): EditPage->runPostMergeFilters(WikitextContent, Status, User) #5 includes/EditPage.php(1500): EditPage->internalAttemptSave(NULL, boolean) #6 includes/EditPage.php(646): EditPage->attemptSave(NULL) #7 includes/actions/EditAction.php(60): EditPage->edit() #8 includes/actions/SubmitAction.php(38): EditAction->show() #9 includes/MediaWiki.php(500): SubmitAction->show() #10 includes/MediaWiki.php(294): MediaWiki->performAction(Article, Title) #11 includes/MediaWiki.php(863): MediaWiki->performRequest() #12 includes/MediaWiki.php(524): MediaWiki->main() #13 index.php(42): MediaWiki->run() #14 {main}