[Bitrix\Main\DB\SqlQueryException] 
Mysql query error: (2006) MySQL server has gone away (400)
SELECT 
	`currency_currency`.`CURRENCY` AS `CURRENCY`
FROM `b_catalog_currency` `currency_currency` 

WHERE `currency_currency`.`CURRENCY` = 'RUB'
/var/www/dalteh/data/www/metiz.guru/bitrix/modules/main/lib/db/mysqliconnection.php:137
#0: Bitrix\Main\DB\MysqliConnection->queryInternal(string, array, NULL)
	/var/www/dalteh/data/www/metiz.guru/bitrix/modules/main/lib/db/connection.php:330
#1: Bitrix\Main\DB\Connection->query(string)
	/var/www/dalteh/data/www/metiz.guru/bitrix/modules/main/lib/orm/query/query.php:3193
#2: Bitrix\Main\ORM\Query\Query->query(string)
	/var/www/dalteh/data/www/metiz.guru/bitrix/modules/main/lib/orm/query/query.php:806
#3: Bitrix\Main\ORM\Query\Query->exec()
	/var/www/dalteh/data/www/metiz.guru/bitrix/modules/main/lib/orm/data/datamanager.php:467
#4: Bitrix\Main\ORM\Data\DataManager::getList(array)
	/var/www/dalteh/data/www/metiz.guru/bitrix/components/bitrix/catalog.smart.filter/class.php:111
#5: CBitrixCatalogSmartFilter->executeComponent()
	/var/www/dalteh/data/www/metiz.guru/bitrix/modules/main/classes/general/component.php:638
#6: CBitrixComponent->includeComponent(string, array, object)
	/var/www/dalteh/data/www/metiz.guru/bitrix/modules/main/classes/general/main.php:1038
#7: CAllMain->IncludeComponent(string, string, array, object, array)
	/var/www/dalteh/data/www/metiz.guru/bitrix/templates/carsan/components/bitrix/catalog/catalog/section.php:316
#8: include(string)
	/var/www/dalteh/data/www/metiz.guru/bitrix/modules/main/classes/general/component_template.php:725
#9: CBitrixComponentTemplate->__IncludePHPTemplate(array, array, string)
	/var/www/dalteh/data/www/metiz.guru/bitrix/modules/main/classes/general/component_template.php:820
#10: CBitrixComponentTemplate->IncludeTemplate(array)
	/var/www/dalteh/data/www/metiz.guru/bitrix/modules/main/classes/general/component.php:735
#11: CBitrixComponent->showComponentTemplate()
	/var/www/dalteh/data/www/metiz.guru/bitrix/modules/main/classes/general/component.php:683
#12: CBitrixComponent->includeComponentTemplate(string)
	/var/www/dalteh/data/www/metiz.guru/bitrix/components/bitrix/catalog/component.php:171
#13: include(string)
	/var/www/dalteh/data/www/metiz.guru/bitrix/modules/main/classes/general/component.php:594
#14: CBitrixComponent->__includeComponent()
	/var/www/dalteh/data/www/metiz.guru/bitrix/modules/main/classes/general/component.php:653
#15: CBitrixComponent->includeComponent(string, array, boolean)
	/var/www/dalteh/data/www/metiz.guru/bitrix/modules/main/classes/general/main.php:1038
#16: CAllMain->IncludeComponent(string, string, array, boolean)
	/var/www/dalteh/data/www/carsan25.ru/catalog/index.php:326
#17: include_once(string)
	/var/www/dalteh/data/www/metiz.guru/bitrix/modules/main/include/urlrewrite.php:159
#18: include_once(string)
	/var/www/dalteh/data/www/metiz.guru/bitrix/urlrewrite.php:2