What is the problem?
On https://vote.wikimedia.beta.wmflabs.org and https://login.wikimedia.beta.wmflabs.org we are seeing the error:
Original exception: [YN8KHIKRRvrNiQEtWdbNeAAAAAM] /wiki/Main_Page InvalidArgumentException: $key must be a string or an array
Backtrace:
from /srv/mediawiki/php-master/includes/language/Message.php(240)
#0 /srv/mediawiki/php-master/includes/GlobalFunctions.php(1183): Message->__construct(integer)
#1 /srv/mediawiki/php-master/includes/context/RequestContext.php(476): wfMessage(integer)
#2 /srv/mediawiki/php-master/includes/context/ContextSource.php(198): RequestContext->msg(integer)
#3 /srv/mediawiki/php-master/includes/skins/Skin.php(2362): ContextSource->msg(integer)
#4 /srv/mediawiki/php-master/includes/skins/Skin.php(2485): Skin->makeLink(integer, array, array)
#5 /srv/mediawiki/php-master/includes/skins/SkinMustache.php(85): Skin->makeListItem(string, array)
#6 /srv/mediawiki/php-master/skins/Vector/includes/SkinVector.php(536): SkinMustache->getPortletData(string, array)
#7 /srv/mediawiki/php-master/includes/skins/SkinMustache.php(244): SkinVector->getPortletData(string, array)
#8 /srv/mediawiki/php-master/includes/skins/SkinMustache.php(199): SkinMustache->getPortletsTemplateData()
#9 /srv/mediawiki/php-master/skins/Vector/includes/SkinVector.php(275): SkinMustache->getTemplateData()
#10 /srv/mediawiki/php-master/includes/skins/SkinMustache.php(137): SkinVector->getTemplateData()
#11 /srv/mediawiki/php-master/includes/skins/SkinTemplate.php(147): SkinMustache->generateHTML()
#12 /srv/mediawiki/php-master/includes/OutputPage.php(2644): SkinTemplate->outputPage()
#13 /srv/mediawiki/php-master/includes/MediaWiki.php(939): OutputPage->output(boolean)
#14 /srv/mediawiki/php-master/includes/MediaWiki.php(952): MediaWiki::{closure}()
#15 /srv/mediawiki/php-master/includes/MediaWiki.php(559): MediaWiki->main()
#16 /srv/mediawiki/php-master/index.php(53): MediaWiki->run()
#17 /srv/mediawiki/php-master/index.php(46): wfIndexMain()
#18 /srv/mediawiki/w/index.php(3): require(string)
#19 {main}This only seems to happen when you are logged out and using the new version of the Vector skin. Therefore, tagging Desktop Improvements.
So you see the error if you go to https://vote.wikimedia.beta.wmflabs.org/wiki/Main_Page?useskin=vector&useskinversion=2 but not https://vote.wikimedia.beta.wmflabs.org/wiki/Main_Page?useskin=vector&useskinversion=1 or https://vote.wikimedia.beta.wmflabs.org/wiki/Main_Page?useskin=minerva.
Nor does it happen on other beta sites, e.g. https://en.wikipedia.beta.wmflabs.org/wiki/Main_Page
Steps to reproduce problem
- Go to https://vote.wikimedia.beta.wmflabs.org/wiki/Main_Page?useskin=vector&useskinversion=2 or https://login.wikimedia.beta.wmflabs.org/wiki/Main_Page?useskin=vector&useskinversion=2
Environment
Wiki(s): MediaWiki 1.37.0-alpha (780ed06) 06:20, 2 July 2021. Vector 1.0.0 (f3a4f9c) 06:32, 2 July 2021.