[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'
/home/bitrix/www/bitrix/modules/main/lib/db/mysqliconnection.php:137
#0: Bitrix\Main\DB\MysqliConnection->queryInternal(string, array, NULL)
	/home/bitrix/www/bitrix/modules/main/lib/db/connection.php:329
#1: Bitrix\Main\DB\Connection->query(string)
	/home/bitrix/www/bitrix/modules/main/lib/entity/query.php:1767
#2: Bitrix\Main\Entity\Query->query(string)
	/home/bitrix/www/bitrix/modules/main/lib/entity/query.php:454
#3: Bitrix\Main\Entity\Query->exec()
	/home/bitrix/www/bitrix/modules/main/lib/entity/datamanager.php:242
#4: Bitrix\Main\Entity\DataManager::getList(array)
	/home/bitrix/www/bitrix/components/bitrix/catalog.element/component.php:405
#5: include(string)
	/home/bitrix/www/bitrix/modules/main/classes/general/component.php:548
#6: CBitrixComponent->__includeComponent()
	/home/bitrix/www/bitrix/modules/main/classes/general/component.php:591
#7: CBitrixComponent->includeComponent(string, array, object)
	/home/bitrix/www/bitrix/modules/main/classes/general/main.php:1035
#8: CAllMain->IncludeComponent(string, string, array, object)
	/home/bitrix/www/local/templates/beger2017/components/bitrix/catalog/beger/element.php:169
#9: include(string)
	/home/bitrix/www/bitrix/modules/main/classes/general/component_template.php:708
#10: CBitrixComponentTemplate->__IncludePHPTemplate(array, array, string)
	/home/bitrix/www/bitrix/modules/main/classes/general/component_template.php:800
#11: CBitrixComponentTemplate->IncludeTemplate(array)
	/home/bitrix/www/bitrix/modules/main/classes/general/component.php:670
#12: CBitrixComponent->showComponentTemplate()
	/home/bitrix/www/bitrix/modules/main/classes/general/component.php:618
#13: CBitrixComponent->includeComponentTemplate(string)
	/home/bitrix/www/bitrix/components/bitrix/catalog/component.php:167
#14: include(string)
	/home/bitrix/www/bitrix/modules/main/classes/general/component.php:548
#15: CBitrixComponent->__includeComponent()
	/home/bitrix/www/bitrix/modules/main/classes/general/component.php:591
#16: CBitrixComponent->includeComponent(string, array, NULL)
	/home/bitrix/www/bitrix/modules/main/classes/general/main.php:1035
#17: CAllMain->IncludeComponent(string, string, array)
	/home/bitrix/www/catalog/index.php:14
#18: include_once(string)
	/home/bitrix/www/bitrix/modules/main/include/urlrewrite.php:163
#19: include_once(string)
	/home/bitrix/www/bitrix/urlrewrite.php:2