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Visit http://en.wikipedia.beta.wmflabs.org/. Get error:

Unexpected non-MediaWiki exception encountered, of type "BadMethodCallException"
[c4477200] /wiki/Main_Page Exception from line 164 of /srv/mediawiki/php-master/extensions/Wikidata/vendor/wikibase/data-model/src/Entity/Item.php: Call to a member function hasLinkWithSiteId() on a non-object (NULL)
Backtrace:
#0 /srv/mediawiki/php-master/extensions/Wikidata/extensions/Wikibase/client/includes/ClientSiteLinkLookup.php(83): Wikibase\DataModel\Entity\Item->hasLinkToSite(string)
#1 /srv/mediawiki/php-master/extensions/Wikidata/extensions/Wikibase/client/includes/hooks/LanguageLinkBadgeDisplay.php(82): Wikibase\Client\ClientSiteLinkLookup->getSiteLink(Title, string)
#2 /srv/mediawiki/php-master/extensions/Wikidata/extensions/Wikibase/client/WikibaseClient.hooks.php(437): Wikibase\Client\Hooks\LanguageLinkBadgeDisplay->assignBadges(Title, Title, array)
#3 /srv/mediawiki/php-master/includes/Hooks.php(206): Wikibase\ClientHooks::onSkinTemplateGetLanguageLink(array, Title, Title)
#4 /srv/mediawiki/php-master/includes/GlobalFunctions.php(3984): Hooks::run(string, array, NULL)
#5 /srv/mediawiki/php-master/includes/skins/SkinTemplate.php(204): wfRunHooks(string, array)
#6 /srv/mediawiki/php-master/includes/skins/SkinTemplate.php(512): SkinTemplate->getLanguages()
#7 /srv/mediawiki/php-master/includes/skins/SkinTemplate.php(274): SkinTemplate->prepareQuickTemplate()
#8 /srv/mediawiki/php-master/includes/OutputPage.php(2171): SkinTemplate->outputPage()
#9 /srv/mediawiki/php-master/includes/MediaWiki.php(594): OutputPage->output()
#10 /srv/mediawiki/php-master/includes/MediaWiki.php(435): MediaWiki->main()
#11 /srv/mediawiki/php-master/index.php(46): MediaWiki->run()
#12 /srv/mediawiki/w/index.php(3): include(string)
#13 {main}