Unexpected non-MediaWiki exception encountered, of type "mysqli_sql_exception"
[f9e612ba] /wiki/index.php?returnto=%D0%A1%D0%BB%D1%83%D0%B6%D0%B5%D0%B1%D0%BD%D0%B0%D1%8F%3A%D0%A3%D0%BA%D0%B0%D0%B7%D0%B0%D1%82%D0%B5%D0%BB%D1%8C+%D0%BF%D0%BE+%D0%BD%D0%B0%D1%87%D0%B0%D0%BB%D1%83+%D0%BD%D0%B0%D0%B7%D0%B2%D0%B0%D0%BD%D0%B8%D1%8F%2FMediaWiki%3ABoteditletter&title=%D0%A1%D0%BB%D1%83%D0%B6%D0%B5%D0%B1%D0%BD%D0%B0%D1%8F%3A%D0%92%D1%85%D0%BE%D0%B4 Exception from line 38 of /var/www/html/wiki/includes/db/DatabaseMysqli.php: MySQL server has gone away
Backtrace:
#0 /var/www/html/wiki/includes/db/DatabaseMysqli.php(38): mysqli->query()
#1 /var/www/html/wiki/includes/db/Database.php(1142): DatabaseMysqli->doQuery()
#2 /var/www/html/wiki/includes/db/Database.php(1650): DatabaseBase->query()
#3 /var/www/html/wiki/includes/db/Database.php(1739): DatabaseBase->select()
#4 /var/www/html/wiki/includes/cache/LocalisationCache.php(1155): DatabaseBase->selectRow()
#5 /var/www/html/wiki/includes/cache/LocalisationCache.php(382): LCStoreDB->get()
#6 /var/www/html/wiki/includes/cache/LocalisationCache.php(280): LocalisationCache->loadSubitem()
#7 /var/www/html/wiki/languages/Language.php(2471): LocalisationCache->getSubitem()
#8 /var/www/html/wiki/includes/cache/MessageCache.php(827): Language->getMessage()
#9 /var/www/html/wiki/includes/cache/MessageCache.php(749): MessageCache->getMessageFromFallbackChain()
#10 /var/www/html/wiki/includes/Message.php(1039): MessageCache->get()
#11 /var/www/html/wiki/includes/Message.php(674): Message->fetchMessage()
#12 /var/www/html/wiki/includes/Message.php(803): Message->toString()
#13 /var/www/html/wiki/includes/specials/SpecialUserlogin.php(163): Message->escaped()
#14 /var/www/html/wiki/includes/specials/SpecialUserlogin.php(232): LoginForm->load()
#15 /var/www/html/wiki/includes/specialpage/SpecialPage.php(363): LoginForm->execute()
#16 /var/www/html/wiki/includes/specialpage/SpecialPageFactory.php(584): SpecialPage->run()
#17 /var/www/html/wiki/includes/MediaWiki.php(275): SpecialPageFactory::executePath()
#18 /var/www/html/wiki/includes/MediaWiki.php(584): MediaWiki->performRequest()
#19 /var/www/html/wiki/includes/MediaWiki.php(435): MediaWiki->main()
#20 /var/www/html/wiki/index.php(46): MediaWiki->run()
#21 {main}