Statistics Explained

Internal error

[ZgZn6RrgO8zyNJrtP5HVxQAAAP8] /statistics_explained/index.php?title=Special:Collection/add_article/&arttitle=Intra-EU_trade_of_the_most_traded_goods&oldid=293036 Error from line 150 of /ec/prod/app/webroot/home/statistics_explained/extensions/StatexpCollection/includes/StatexpCollection.php: Call to a member function getTimestamp() on null

Backtrace:

#0 /ec/prod/app/webroot/home/statistics_explained/extensions/StatexpCollection/includes/SpecialStatexpCollection.php(57): StatexpCollection::addArticle(Title, integer)
#1 /ec/prod/app/webroot/home/statistics_explained/includes/specialpage/SpecialPage.php(600): SpecialStatexpCollection->execute(string)
#2 /ec/prod/app/webroot/home/statistics_explained/includes/specialpage/SpecialPageFactory.php(635): SpecialPage->run(string)
#3 /ec/prod/app/webroot/home/statistics_explained/includes/MediaWiki.php(307): MediaWiki\SpecialPage\SpecialPageFactory->executePath(Title, RequestContext)
#4 /ec/prod/app/webroot/home/statistics_explained/includes/MediaWiki.php(945): MediaWiki->performRequest()
#5 /ec/prod/app/webroot/home/statistics_explained/includes/MediaWiki.php(548): MediaWiki->main()
#6 /ec/prod/app/webroot/home/statistics_explained/index.php(89): MediaWiki->run()
#7 /ec/prod/app/webroot/home/statistics_explained/index.php(103): wfIndexMain()
#8 {main}