[Bitrix\Main\DB\SqlQueryException] 
Mysql query error: (2006) MySQL server has gone away (400)
SELECT 
	`main_site`.`LID` AS `LID`,
	`main_site`.`SORT` AS `SORT`,
	`main_site`.`DEF` AS `DEF`,
	`main_site`.`ACTIVE` AS `ACTIVE`,
	`main_site`.`NAME` AS `NAME`,
	`main_site`.`DIR` AS `DIR`,
	`main_site`.`LANGUAGE_ID` AS `LANGUAGE_ID`,
	`main_site`.`DOC_ROOT` AS `DOC_ROOT`,
	`main_site`.`DOMAIN_LIMITED` AS `DOMAIN_LIMITED`,
	`main_site`.`SERVER_NAME` AS `SERVER_NAME`,
	`main_site`.`SITE_NAME` AS `SITE_NAME`,
	`main_site`.`EMAIL` AS `EMAIL`,
	`main_site`.`CULTURE_ID` AS `CULTURE_ID`,
	`main_site_domain`.`DOMAIN` AS `SITE_DOMAIN`,
	`main_site_site`.`HTTPS` AS `SITE_HTTPS`,
	`main_site_site`.`WWW` AS `SITE_WWW`,
	`main_site_site`.`SLASH` AS `SITE_SLASH`,
	`main_site_site`.`DOUBLE_SLASH` AS `SITE_DOUBLE_SLASH`,
	`main_site_site`.`INDEX` AS `SITE_INDEX`,
	`main_site_site`.`LOWER_CASE` AS `SITE_LOWER_CASE`,
	`main_site_site`.`DATE_MODIFIED` AS `SITE_DATE_MODIFIED`,
	`main_site_domain`.`LID` AS `UALIAS_0`,
	`main_site_site`.`SITE_ID` AS `UALIAS_1`
FROM `b_lang` `main_site` 
LEFT JOIN `b_lang_domain` `main_site_domain` ON `main_site_domain`.`LID` = `main_site`.`LID`
LEFT JOIN `wd_seo_site` `main_site_site` ON `main_site_site`.`SITE_ID` = `main_site`.`LID`
WHERE `main_site`.`LID` = 's2'
/home/bitrix/www/bitrix/modules/main/lib/db/mysqliconnection.php:153
#0: Bitrix\Main\DB\MysqliConnection->queryInternal
	/home/bitrix/www/bitrix/modules/main/lib/db/connection.php:327
#1: Bitrix\Main\DB\Connection->query
	/home/bitrix/www/bitrix/modules/main/lib/orm/query/query.php:3537
#2: Bitrix\Main\ORM\Query\Query->query
	/home/bitrix/www/bitrix/modules/main/lib/orm/query/query.php:952
#3: Bitrix\Main\ORM\Query\Query->exec
	/home/bitrix/www/bitrix/modules/main/lib/orm/data/datamanager.php:513
#4: Bitrix\Main\ORM\Data\DataManager::getList
	/home/bitrix/www/bitrix/modules/webdebug.seo/lib/site.php:98
#5: WD\Seo\SiteTable::getByIdExt
	/home/bitrix/www/bitrix/modules/webdebug.seo/lib/site.php:192
#6: WD\Seo\SiteTable::prepare
	/home/bitrix/www/bitrix/modules/webdebug.seo/lib/eventhandler.php:19
#7: WD\Seo\EventHandler::onPageStart
	/home/bitrix/www/bitrix/modules/main/classes/general/module.php:483
#8: ExecuteModuleEventEx
	/home/bitrix/www/bitrix/modules/main/include.php:1
#9: require_once(string)
	/home/bitrix/www/bitrix/modules/main/include/prolog_before.php:19
#10: require_once(string)
	/home/bitrix/www/bitrix/modules/main/include/prolog.php:10
#11: require_once(string)
	/home/bitrix/www/bitrix/header.php:1
#12: require(string)
	/home/bitrix/www/catalog/index.php:1
#13: include_once(string)
	/home/bitrix/www/bitrix/modules/main/include/urlrewrite.php:184
#14: include_once(string)
	/home/bitrix/www/bitrix/urlrewrite.php:2
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