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Backtrace:

#0 /var/www/html/mediawiki/includes/libs/rdbms/loadbalancer/LoadBalancer.php(934): Wikimedia\Rdbms\LoadBalancer->reportConnectionError()
#1 /var/www/html/mediawiki/includes/libs/rdbms/loadbalancer/LoadBalancer.php(901): Wikimedia\Rdbms\LoadBalancer->getServerConnection()
#2 /var/www/html/mediawiki/includes/libs/rdbms/loadbalancer/LoadBalancer.php(1046): Wikimedia\Rdbms\LoadBalancer->getConnection()
#3 /var/www/html/mediawiki/includes/GlobalFunctions.php(2463): Wikimedia\Rdbms\LoadBalancer->getMaintenanceConnectionRef()
#4 /var/www/html/mediawiki/extensions/Gadgets/includes/MediaWikiGadgetsDefinitionRepo.php(106): wfGetDB()
#5 /var/www/html/mediawiki/includes/libs/objectcache/wancache/WANObjectCache.php(1529): MediaWikiGadgetsDefinitionRepo->{closure}()
#6 /var/www/html/mediawiki/includes/libs/objectcache/wancache/WANObjectCache.php(1376): WANObjectCache->fetchOrRegenerate()
#7 /var/www/html/mediawiki/extensions/Gadgets/includes/MediaWikiGadgetsDefinitionRepo.php(116): WANObjectCache->getWithSetCallback()
#8 /var/www/html/mediawiki/extensions/Gadgets/includes/MediaWikiGadgetsDefinitionRepo.php(32): MediaWikiGadgetsDefinitionRepo->loadGadgets()
#9 /var/www/html/mediawiki/extensions/Gadgets/includes/GadgetRepo.php(71): MediaWikiGadgetsDefinitionRepo->getGadgetIds()
#10 /var/www/html/mediawiki/extensions/Gadgets/includes/GadgetHooks.php(114): GadgetRepo->getStructuredList()
#11 /var/www/html/mediawiki/includes/HookContainer/HookContainer.php(329): GadgetHooks::userGetDefaultOptions()
#12 /var/www/html/mediawiki/includes/HookContainer/HookContainer.php(132): MediaWiki\HookContainer\HookContainer->callLegacyHook()
#13 /var/www/html/mediawiki/includes/HookContainer/HookRunner.php(4254): MediaWiki\HookContainer\HookContainer->run()
#14 /var/www/html/mediawiki/includes/user/DefaultOptionsLookup.php(99): MediaWiki\HookContainer\HookRunner->onUserGetDefaultOptions()
#15 /var/www/html/mediawiki/includes/user/UserOptionsManager.php(494): MediaWiki\User\DefaultOptionsLookup->getDefaultOptions()
#16 /var/www/html/mediawiki/includes/user/UserOptionsManager.php(135): MediaWiki\User\UserOptionsManager->loadUserOptions()
#17 /var/www/html/mediawiki/includes/user/User.php(2670): MediaWiki\User\UserOptionsManager->getOption()
#18 /var/www/html/mediawiki/includes/context/RequestContext.php(355): User->getOption()
#19 /var/www/html/mediawiki/includes/language/Message.php(723): RequestContext->getLanguage()
#20 /var/www/html/mediawiki/includes/context/RequestContext.php(447): Message->setContext()
#21 /var/www/html/mediawiki/includes/specialpage/SpecialPage.php(829): RequestContext->msg()
#22 /var/www/html/mediawiki/includes/specialpage/SpecialPage.php(687): SpecialPage->msg()
#23 /var/www/html/mediawiki/includes/specialpage/SpecialPage.php(575): SpecialPage->getDescription()
#24 /var/www/html/mediawiki/includes/specials/SpecialPrefixindex.php(51): SpecialPage->setHeaders()
#25 /var/www/html/mediawiki/includes/specialpage/SpecialPage.php(600): SpecialPrefixindex->execute()
#26 /var/www/html/mediawiki/includes/specialpage/SpecialPageFactory.php(635): SpecialPage->run()
#27 /var/www/html/mediawiki/includes/MediaWiki.php(307): MediaWiki\SpecialPage\SpecialPageFactory->executePath()
#28 /var/www/html/mediawiki/includes/MediaWiki.php(945): MediaWiki->performRequest()
#29 /var/www/html/mediawiki/includes/MediaWiki.php(548): MediaWiki->main()
#30 /var/www/html/mediawiki/index.php(53): MediaWiki->run()
#31 /var/www/html/mediawiki/index.php(46): wfIndexMain()
#32 {main}