Error
Request ID: W6KtvwrAIDMAACkj8C0AAAAQ
[{exception_id}] {exception_url} ErrorException from line 607 of /srv/mediawiki/php-1.32.0-wmf.22/extensions/WikimediaIncubator/WikimediaIncubator.class.php: PHP Notice: Undefined index: realtitle
#1 /srv/mediawiki/php-1.32.0-wmf.22/includes/Hooks.php(174): WikimediaIncubator::onShowMissingArticle(Article) #2 /srv/mediawiki/php-1.32.0-wmf.22/includes/Hooks.php(202): Hooks::callHook(string, array, array, NULL) #3 /srv/mediawiki/php-1.32.0-wmf.22/includes/page/Article.php(1390): Hooks::run(string, array) #4 /srv/mediawiki/php-1.32.0-wmf.22/includes/page/Article.php(681): Article->showMissingArticle() #5 /srv/mediawiki/php-1.32.0-wmf.22/includes/actions/ViewAction.php(68): Article->view() #6 /srv/mediawiki/php-1.32.0-wmf.22/includes/MediaWiki.php(501): ViewAction->show() #7 /srv/mediawiki/php-1.32.0-wmf.22/includes/MediaWiki.php(294): MediaWiki->performAction(Article, Title) #8 /srv/mediawiki/php-1.32.0-wmf.22/includes/MediaWiki.php(868): MediaWiki->performRequest() #9 /srv/mediawiki/php-1.32.0-wmf.22/includes/MediaWiki.php(525): MediaWiki->main() #10 /srv/mediawiki/php-1.32.0-wmf.22/index.php(42): MediaWiki->run()
Notes
This is seem from a handful of Incubator page views, some of them in a pattern that (anonimised by using my own nick instead) look like https://incubator.wikimedia.org/wiki/User%2Btalk:Krinkle/XYZ.js/i18n.
The response looks erroneous, in that it is linking to a domain that does not exist: https://xyz.js.wikisource.org.