Eneter 'Mavetuna33 2' in Search box and click 'search'.
The error page will be displayed:
https://en.wikipedia.beta.wmflabs.org/w/index.php?search=Mavetuna33+2&title=Special%3ASearch
```
[V@RZmApEE4AAAG-AHzwAAAAL] /w/index.php?search=Mavetuna33+2&title=Special%3ASearch BadMethodCallException from line 6062 of /srv/mediawiki/php-master/includes/parser/Parser.php: Call to a member function getMagicISBNLinks() on a non-object (null)
Backtrace:
#0 /srv/mediawiki/php-master/includes/GlobalFunctions.php(1671): Parser->escapeWikitext(string)
#1 /srv/mediawiki/php-master/includes/specials/SpecialSearch.php(600): wfEscapeWikiText(string)
#2 /srv/mediawiki/php-master/includes/specials/SpecialSearch.php(372): SpecialSearch->showCreateLink(Title, integer, NULL, CirrusSearch\Search\ResultSet)
#3 /srv/mediawiki/php-master/includes/specials/SpecialSearch.php(242): SpecialSearch->showResults(string)
#4 /srv/mediawiki/php-master/includes/specials/SpecialSearch.php(152): SpecialSearch->goResult(string)
#5 /srv/mediawiki/php-master/includes/specialpage/SpecialPage.php(522): SpecialSearch->execute(NULL)
#6 /srv/mediawiki/php-master/includes/specialpage/SpecialPageFactory.php(583): SpecialPage->run(NULL)
#7 /srv/mediawiki/php-master/includes/MediaWiki.php(283): SpecialPageFactory::executePath(Title, RequestContext)
#8 /srv/mediawiki/php-master/includes/MediaWiki.php(861): MediaWiki->performRequest()
#9 /srv/mediawiki/php-master/includes/MediaWiki.php(522): MediaWiki->main()
#10 /srv/mediawiki/php-master/index.php(43): MediaWiki->run()
#11 /srv/mediawiki/w/index.php(3): include(string)
#12 {main}
```
{F4514966}
The `logging` table shows multiple deletion, but I cannot figure out what makes this specific error to be displayed.