[Bitrix\Main\DB\SqlQueryException] 
Mysql query error: (2006) MySQL server has gone away (400)
SELECT 
	`dev2fun_multi_domain`.`ID` AS `ID`,
	`dev2fun_multi_domain`.`UF_ACTIVE` AS `UF_ACTIVE`,
	`dev2fun_multi_domain`.`UF_NAME` AS `UF_NAME`,
	`dev2fun_multi_domain`.`UF_CITY` AS `UF_CITY`,
	`dev2fun_multi_domain`.`UF_COORD` AS `UF_COORD`,
	`dev2fun_multi_domain`.`UF_ADDRESS` AS `UF_ADDRESS`,
	`dev2fun_multi_domain`.`UF_BIG` AS `UF_BIG`,
	`dev2fun_multi_domain`.`UF_CALLTRACKING` AS `UF_CALLTRACKING`,
	`dev2fun_multi_domain`.`UF_SUBDOMAIN` AS `UF_SUBDOMAIN`,
	`dev2fun_multi_domain`.`UF_DOMAIN` AS `UF_DOMAIN`,
	`dev2fun_multi_domain`.`UF_CODE_COUNTERS` AS `UF_CODE_COUNTERS`,
	`dev2fun_multi_domain`.`UF_META_TAGS` AS `UF_META_TAGS`,
	`dev2fun_multi_domain`.`UF_LANG` AS `UF_LANG`
FROM `dev2fun_multidomain` `dev2fun_multi_domain` 

WHERE UPPER(`dev2fun_multi_domain`.`UF_DOMAIN`) like upper('nova-m.com')
AND UPPER(`dev2fun_multi_domain`.`UF_SUBDOMAIN`) like upper('zheleznodorozhnyy')
ORDER BY `ID` ASC
/home/web/nova-m.com/www/bitrix/modules/main/lib/db/mysqliconnection.php:137
#0: Bitrix\Main\DB\MysqliConnection->queryInternal(string, array, NULL)
	/home/web/nova-m.com/www/bitrix/modules/main/lib/db/connection.php:330
#1: Bitrix\Main\DB\Connection->query(string)
	/home/web/nova-m.com/www/bitrix/modules/main/lib/entity/query.php:3038
#2: Bitrix\Main\Entity\Query->query(string)
	/home/web/nova-m.com/www/bitrix/modules/main/lib/entity/query.php:797
#3: Bitrix\Main\Entity\Query->exec()
	/home/web/nova-m.com/www/bitrix/modules/main/lib/entity/datamanager.php:290
#4: Bitrix\Main\Entity\DataManager::getList(array)
	/home/web/nova-m.com/www/bitrix/modules/dev2fun.multidomain/lib/HLHelpers.php:144
#5: Dev2fun\MultiDomain\HLHelpers->getElementsResource(string, array, array, array, array)
	/home/web/nova-m.com/www/bitrix/modules/dev2fun.multidomain/lib/HLHelpers.php:158
#6: Dev2fun\MultiDomain\HLHelpers->getElementList(string, array)
	/home/web/nova-m.com/www/bitrix/modules/dev2fun.multidomain/classes/general/SubDomain.php:119
#7: Dev2fun\MultiDomain\SubDomain->check()
	/home/web/nova-m.com/www/bitrix/modules/dev2fun.multidomain/include.php:64
#8: Dev2fun\MultiDomain\Base::InitDomains()
	/home/web/nova-m.com/www/bitrix/modules/main/classes/general/module.php:490
#9: ExecuteModuleEventEx(array)
	/home/web/nova-m.com/www/bitrix/modules/main/include.php:281
#10: require_once(string)
	/home/web/nova-m.com/www/bitrix/modules/main/include/prolog_before.php:14
#11: require_once(string)
	/home/web/nova-m.com/www/bitrix/modules/main/include/prolog.php:8
#12: require_once(string)
	/home/web/nova-m.com/www/bitrix/header.php:1
#13: require(string)
	/home/web/nova-m.com/www/proizvoditeli/index.php:2
#14: include_once(string)
	/home/web/nova-m.com/www/bitrix/modules/main/include/urlrewrite.php:159
#15: include_once(string)
	/home/web/nova-m.com/www/bitrix/urlrewrite.php:2