MediaWiki internal error.

Original exception: [YiEu-egwCAukOg6sPvwfbwAAAGM] /bullpen/Balboa Wikimedia\Rdbms\DBUnexpectedError from line 5461 of /home/br/www/bpv/includes/libs/rdbms/database/Database.php: DB connection was already closed or the connection dropped
Backtrace:
#0 /home/br/www/bpv/includes/libs/rdbms/database/DatabaseMysqli.php(304): Wikimedia\Rdbms\Database->getBindingHandle()
#1 /home/br/www/bpv/includes/libs/rdbms/database/DatabaseMysqli.php(295): Wikimedia\Rdbms\DatabaseMysqli->getBindingHandle()
#2 /home/br/www/bpv/includes/libs/rdbms/database/DatabaseMysqlBase.php(637): Wikimedia\Rdbms\DatabaseMysqli->mysqlRealEscapeString(string)
#3 /home/br/www/bpv/includes/libs/rdbms/database/Database.php(3121): Wikimedia\Rdbms\DatabaseMysqlBase->strencode(string)
#4 /home/br/www/bpv/includes/libs/rdbms/database/Database.php(2509): Wikimedia\Rdbms\Database->addQuotes(string)
#5 /home/br/www/bpv/includes/libs/rdbms/database/Database.php(2545): Wikimedia\Rdbms\Database->makeList(array, integer)
#6 /home/br/www/bpv/includes/libs/rdbms/database/DBConnRef.php(68): Wikimedia\Rdbms\Database->makeWhereFrom2d(array, string, string)
#7 /home/br/www/bpv/includes/libs/rdbms/database/DBConnRef.php(383): Wikimedia\Rdbms\DBConnRef->__call(string, array)
#8 /home/br/www/bpv/includes/cache/LinkBatch.php(299): Wikimedia\Rdbms\DBConnRef->makeWhereFrom2d(array, string, string)
#9 /home/br/www/bpv/includes/OutputPage.php(1427): LinkBatch->constructSet(string, Wikimedia\Rdbms\MaintainableDBConnRef)
#10 /home/br/www/bpv/includes/OutputPage.php(1371): OutputPage->addCategoryLinksToLBAndGetResult(array)
#11 /home/br/www/bpv/includes/OutputPage.php(1882): OutputPage->addCategoryLinks(array)
#12 /home/br/www/bpv/includes/OutputPage.php(2016): OutputPage->addParserOutputMetadata(ParserOutput)
#13 /home/br/www/bpv/includes/page/Article.php(843): OutputPage->addParserOutput(ParserOutput, array)
#14 /home/br/www/bpv/includes/actions/ViewAction.php(74): Article->view()
#15 /home/br/www/bpv/includes/MediaWiki.php(531): ViewAction->show()
#16 /home/br/www/bpv/includes/MediaWiki.php(317): MediaWiki->performAction(Article, Title)
#17 /home/br/www/bpv/includes/MediaWiki.php(952): MediaWiki->performRequest()
#18 /home/br/www/bpv/includes/MediaWiki.php(547): MediaWiki->main()
#19 /home/br/www/bpv/index.php(56): MediaWiki->run()
#20 /home/br/www/bpv/index.php(49): wfIndexMain()
#21 {main}

Exception caught inside exception handler: [YiEu-egwCAukOg6sPvwfbwAAAGM] /bullpen/Balboa InvalidArgumentException from line 58 of /home/br/www/bpv/includes/libs/rdbms/database/DBConnRef.php: Missing lazy connection arguments.
Backtrace:
#0 /home/br/www/bpv/includes/libs/rdbms/loadbalancer/LoadBalancer.php(1031): Wikimedia\Rdbms\DBConnRef->__construct(Wikimedia\Rdbms\LoadBalancer, boolean, integer)
#1 /home/br/www/bpv/includes/cache/LinkBatch.php(253): Wikimedia\Rdbms\LoadBalancer->getConnectionRef(integer)
#2 /home/br/www/bpv/includes/cache/LinkBatch.php(186): LinkBatch->doQuery()
#3 /home/br/www/bpv/includes/cache/LinkBatch.php(175): LinkBatch->executeInto(LinkCache)
#4 /home/br/www/bpv/includes/skins/Skin.php(313): LinkBatch->execute()
#5 /home/br/www/bpv/includes/skins/Skin.php(177): Skin->preloadExistence()
#6 /home/br/www/bpv/skins/Klecko/Klecko.skin.php(22): Skin->initPage(OutputPage)
#7 /home/br/www/bpv/includes/skins/SkinTemplate.php(140): SkinKlecko->initPage(OutputPage)
#8 /home/br/www/bpv/includes/OutputPage.php(2622): SkinTemplate->outputPage()
#9 /home/br/www/bpv/includes/exception/MWExceptionRenderer.php(153): OutputPage->output()
#10 /home/br/www/bpv/includes/exception/MWExceptionRenderer.php(65): MWExceptionRenderer::reportHTML(Wikimedia\Rdbms\DBUnexpectedError)
#11 /home/br/www/bpv/includes/exception/MWExceptionHandler.php(106): MWExceptionRenderer::output(Wikimedia\Rdbms\DBUnexpectedError, integer)
#12 /home/br/www/bpv/includes/exception/MWExceptionHandler.php(185): MWExceptionHandler::report(Wikimedia\Rdbms\DBUnexpectedError)
#13 /home/br/www/bpv/includes/MediaWiki.php(580): MWExceptionHandler::handleException(Wikimedia\Rdbms\DBUnexpectedError, string)
#14 /home/br/www/bpv/index.php(56): MediaWiki->run()
#15 /home/br/www/bpv/index.php(49): wfIndexMain()
#16 {main}