When installing mediawiki/extensions/AkismetKlik it seems to work fine but loading a page ends up with a trace:
```
#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}
```