MediaWiki internal error.

Original exception: [0e8fc5bd8832508386d4e826] /index.php?title=User:Bjorn&mobileaction=toggle_view_mobile Error: Call to undefined method MediaWiki\User\User::idFromName()
Backtrace:
from /bitnami/mediawiki/skins/MinervaNeue/includes/Skins/SkinUserPageHelper.php(92)
#0 /bitnami/mediawiki/skins/MinervaNeue/includes/Skins/SkinUserPageHelper.php(73): MediaWiki\Minerva\Skins\SkinUserPageHelper->buildPageUserObject()
#1 /bitnami/mediawiki/skins/MinervaNeue/includes/Skins/SkinUserPageHelper.php(111): MediaWiki\Minerva\Skins\SkinUserPageHelper->fetchData()
#2 /bitnami/mediawiki/skins/MinervaNeue/includes/Hooks.php(254): MediaWiki\Minerva\Skins\SkinUserPageHelper->isUserPage()
#3 /bitnami/mediawiki/skins/MinervaNeue/includes/Hooks.php(337): MediaWiki\Minerva\Hooks::setMinervaSkinOptions()
#4 /opt/bitnami/mediawiki/includes/HookContainer/HookContainer.php(161): MediaWiki\Minerva\Hooks::onRequestContextCreateSkinMobile()
#5 /bitnami/mediawiki/extensions/MobileFrontend/includes/MobileFrontendHooks.php(128): MediaWiki\HookContainer\HookContainer->run()
#6 /opt/bitnami/mediawiki/includes/HookContainer/HookContainer.php(161): MobileFrontendHooks::onRequestContextCreateSkin()
#7 /opt/bitnami/mediawiki/includes/HookContainer/HookRunner.php(3258): MediaWiki\HookContainer\HookContainer->run()
#8 /opt/bitnami/mediawiki/includes/context/RequestContext.php(550): MediaWiki\HookContainer\HookRunner->onRequestContextCreateSkin()
#9 /opt/bitnami/mediawiki/includes/context/RequestContext.php(560): RequestContext->getSkinFromHook()
#10 /opt/bitnami/mediawiki/includes/context/ContextSource.php(179): RequestContext->getSkin()
#11 /opt/bitnami/mediawiki/includes/Output/OutputPage.php(2935): ContextSource->getSkin()
#12 /opt/bitnami/mediawiki/includes/MediaWiki.php(978): MediaWiki\Output\OutputPage->output()
#13 /opt/bitnami/mediawiki/includes/MediaWiki.php(613): MediaWiki->main()
#14 /opt/bitnami/mediawiki/index.php(50): MediaWiki->run()
#15 /opt/bitnami/mediawiki/index.php(46): wfIndexMain()
#16 {main}

Exception caught inside exception handler: [0e8fc5bd8832508386d4e826] /index.php?title=User:Bjorn&mobileaction=toggle_view_mobile Error: Call to undefined method MediaWiki\User\User::idFromName()
Backtrace:
from /bitnami/mediawiki/skins/MinervaNeue/includes/Skins/SkinUserPageHelper.php(92)
#0 /bitnami/mediawiki/skins/MinervaNeue/includes/Skins/SkinUserPageHelper.php(73): MediaWiki\Minerva\Skins\SkinUserPageHelper->buildPageUserObject()
#1 /bitnami/mediawiki/skins/MinervaNeue/includes/Skins/SkinUserPageHelper.php(111): MediaWiki\Minerva\Skins\SkinUserPageHelper->fetchData()
#2 /bitnami/mediawiki/skins/MinervaNeue/includes/Skins/SkinMinerva.php(972): MediaWiki\Minerva\Skins\SkinUserPageHelper->isUserPage()
#3 /bitnami/mediawiki/skins/MinervaNeue/includes/Skins/SkinMinerva.php(939): MediaWiki\Minerva\Skins\SkinMinerva->getSkinStyles()
#4 /opt/bitnami/mediawiki/includes/Output/OutputPage.php(2821): MediaWiki\Minerva\Skins\SkinMinerva->getDefaultModules()
#5 /opt/bitnami/mediawiki/includes/Output/OutputPage.php(2936): MediaWiki\Output\OutputPage->loadSkinModules()
#6 /opt/bitnami/mediawiki/includes/exception/MWExceptionRenderer.php(188): MediaWiki\Output\OutputPage->output()
#7 /opt/bitnami/mediawiki/includes/exception/MWExceptionRenderer.php(105): MWExceptionRenderer::reportHTML()
#8 /opt/bitnami/mediawiki/includes/exception/MWExceptionHandler.php(134): MWExceptionRenderer::output()
#9 /opt/bitnami/mediawiki/includes/exception/MWExceptionHandler.php(251): MWExceptionHandler::report()
#10 /opt/bitnami/mediawiki/includes/MediaWiki.php(635): MWExceptionHandler::handleException()
#11 /opt/bitnami/mediawiki/index.php(50): MediaWiki->run()
#12 /opt/bitnami/mediawiki/index.php(46): wfIndexMain()
#13 {main}