MediaWiki internal error.

Original exception: [adcd376f03eb76dadc33e94c] /wiki/User:LindaClark InvalidArgumentException: Actor name can not be empty for 0 and 5334
Backtrace:
from /var/www/mediawiki-1.39.4/includes/user/ActorStore.php(168)
#0 /var/www/mediawiki-1.39.4/includes/block/DatabaseBlock.php(439): MediaWiki\User\ActorStore->newActorFromRowFields()
#1 /var/www/mediawiki-1.39.4/includes/block/DatabaseBlock.php(466): MediaWiki\Block\DatabaseBlock->initFromRow()
#2 /var/www/mediawiki-1.39.4/includes/block/DatabaseBlock.php(298): MediaWiki\Block\DatabaseBlock::newFromRow()
#3 /var/www/mediawiki-1.39.4/includes/block/DatabaseBlock.php(887): MediaWiki\Block\DatabaseBlock::newLoad()
#4 /var/www/mediawiki-1.39.4/includes/block/DatabaseBlock.php(854): MediaWiki\Block\DatabaseBlock::newListFromTarget()
#5 /var/www/mediawiki-1.39.4/includes/page/Article.php(1355): MediaWiki\Block\DatabaseBlock::newFromTarget()
#6 /var/www/mediawiki-1.39.4/includes/page/Article.php(605): Article->showMissingArticle()
#7 /var/www/mediawiki-1.39.4/includes/page/Article.php(528): Article->generateContentOutput()
#8 /var/www/mediawiki-1.39.4/includes/actions/ViewAction.php(78): Article->view()
#9 /var/www/mediawiki-1.39.4/includes/MediaWiki.php(542): ViewAction->show()
#10 /var/www/mediawiki-1.39.4/includes/MediaWiki.php(322): MediaWiki->performAction()
#11 /var/www/mediawiki-1.39.4/includes/MediaWiki.php(904): MediaWiki->performRequest()
#12 /var/www/mediawiki-1.39.4/includes/MediaWiki.php(562): MediaWiki->main()
#13 /var/www/mediawiki-1.39.4/index.php(50): MediaWiki->run()
#14 /var/www/mediawiki-1.39.4/index.php(46): wfIndexMain()
#15 {main}

Exception caught inside exception handler: [adcd376f03eb76dadc33e94c] /wiki/User:LindaClark InvalidArgumentException: Actor name can not be empty for 0 and 5334
Backtrace:
from /var/www/mediawiki-1.39.4/includes/user/ActorStore.php(168)
#0 /var/www/mediawiki-1.39.4/includes/block/DatabaseBlock.php(439): MediaWiki\User\ActorStore->newActorFromRowFields()
#1 /var/www/mediawiki-1.39.4/includes/block/DatabaseBlock.php(466): MediaWiki\Block\DatabaseBlock->initFromRow()
#2 /var/www/mediawiki-1.39.4/includes/block/DatabaseBlock.php(298): MediaWiki\Block\DatabaseBlock::newFromRow()
#3 /var/www/mediawiki-1.39.4/includes/block/DatabaseBlock.php(887): MediaWiki\Block\DatabaseBlock::newLoad()
#4 /var/www/mediawiki-1.39.4/includes/block/BlockManager.php(172): MediaWiki\Block\DatabaseBlock::newListFromTarget()
#5 /var/www/mediawiki-1.39.4/includes/skins/Skin.php(527): MediaWiki\Block\BlockManager->getUserBlock()
#6 /var/www/mediawiki-1.39.4/includes/skins/Skin.php(1371): Skin->getRelevantUser()
#7 /var/www/mediawiki-1.39.4/includes/skins/Skin.php(1530): Skin->buildNavUrls()
#8 /var/www/mediawiki-1.39.4/includes/skins/SkinTemplate.php(792): Skin->buildSidebar()
#9 /var/www/mediawiki-1.39.4/includes/skins/SkinTemplate.php(229): SkinTemplate->getPortletsTemplateData()
#10 /var/www/mediawiki-1.39.4/includes/skins/SkinMustache.php(88): SkinTemplate->getTemplateData()
#11 /var/www/mediawiki-1.39.4/skins/Vector/includes/SkinVector.php(450): SkinMustache->getTemplateData()
#12 /var/www/mediawiki-1.39.4/includes/skins/SkinMustache.php(58): MediaWiki\Skins\Vector\SkinVector->getTemplateData()
#13 /var/www/mediawiki-1.39.4/includes/skins/SkinTemplate.php(177): SkinMustache->generateHTML()
#14 /var/www/mediawiki-1.39.4/includes/OutputPage.php(2876): SkinTemplate->outputPage()
#15 /var/www/mediawiki-1.39.4/includes/exception/MWExceptionRenderer.php(183): OutputPage->output()
#16 /var/www/mediawiki-1.39.4/includes/exception/MWExceptionRenderer.php(102): MWExceptionRenderer::reportHTML()
#17 /var/www/mediawiki-1.39.4/includes/exception/MWExceptionHandler.php(131): MWExceptionRenderer::output()
#18 /var/www/mediawiki-1.39.4/includes/exception/MWExceptionHandler.php(248): MWExceptionHandler::report()
#19 /var/www/mediawiki-1.39.4/includes/MediaWiki.php(581): MWExceptionHandler::handleException()
#20 /var/www/mediawiki-1.39.4/index.php(50): MediaWiki->run()
#21 /var/www/mediawiki-1.39.4/index.php(46): wfIndexMain()
#22 {main}