[Bitrix\Main\DB\SqlQueryException] 
Mysql query error: (2006) MySQL server has gone away (400)
SELECT 
	`currency_currency_lang`.`CURRENCY` AS `CURRENCY`,
	`currency_currency_lang`.`LID` AS `LID`,
	`currency_currency_lang`.`FORMAT_STRING` AS `FORMAT_STRING`,
	`currency_currency_lang`.`FULL_NAME` AS `FULL_NAME`,
	`currency_currency_lang`.`DEC_POINT` AS `DEC_POINT`,
	`currency_currency_lang`.`THOUSANDS_SEP` AS `THOUSANDS_SEP`,
	`currency_currency_lang`.`DECIMALS` AS `DECIMALS`,
	`currency_currency_lang`.`THOUSANDS_VARIANT` AS `THOUSANDS_VARIANT`,
	`currency_currency_lang`.`HIDE_ZERO` AS `HIDE_ZERO`,
	`currency_currency_lang`.`CREATED_BY` AS `CREATED_BY`,
	`currency_currency_lang`.`DATE_CREATE` AS `DATE_CREATE`,
	`currency_currency_lang`.`MODIFIED_BY` AS `MODIFIED_BY`,
	`currency_currency_lang`.`TIMESTAMP_X` AS `TIMESTAMP_X`
FROM `b_catalog_currency_lang` `currency_currency_lang` 

WHERE `currency_currency_lang`.`CURRENCY` = 'RUB'
AND `currency_currency_lang`.`LID` = 'ru'
/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:330
#1: Bitrix\Main\DB\Connection->query(string)
	/home/bitrix/www/bitrix/modules/main/lib/orm/query/query.php:3398
#2: Bitrix\Main\ORM\Query\Query->query(string)
	/home/bitrix/www/bitrix/modules/main/lib/orm/query/query.php:825
#3: Bitrix\Main\ORM\Query\Query->exec()
	/home/bitrix/www/bitrix/modules/main/lib/orm/data/datamanager.php:500
#4: Bitrix\Main\ORM\Data\DataManager::getList(array)
	/home/bitrix/www/bitrix/modules/main/lib/orm/data/datamanager.php:361
#5: Bitrix\Main\ORM\Data\DataManager::getByPrimary(array)
	/home/bitrix/www/bitrix/modules/conversion/lib/utils.php:63
#6: Bitrix\Conversion\Utils::getBaseCurrencyUnit()
	/home/bitrix/www/bitrix/modules/sale/lib/internals/conversionhandlers.php:47
#7: Bitrix\Sale\Internals\ConversionHandlers::onGetRateTypes()
	/home/bitrix/www/bitrix/modules/main/classes/general/module.php:480
#8: ExecuteModuleEventEx(array)
	/home/bitrix/www/bitrix/modules/conversion/lib/internals/typemanager.php:22
#9: Bitrix\Conversion\Internals\TypeManager::getTypesInternal()
	/home/bitrix/www/bitrix/modules/conversion/lib/internals/typemanager.php:53
#10: Bitrix\Conversion\Internals\TypeManager::getTypes(array)
	/home/bitrix/www/bitrix/modules/abtest/lib/adminhelper.php:113
#11: Bitrix\ABTest\AdminHelper::getSiteCapacity(string)
	/home/bitrix/www/bitrix/modules/abtest/lib/helper.php:53
#12: Bitrix\ABTest\Helper::getActiveTest()
	/home/bitrix/www/bitrix/modules/abtest/lib/helper.php:126
#13: Bitrix\ABTest\Helper::getContext()
	/home/bitrix/www/bitrix/modules/abtest/lib/eventhandler.php:37
#14: Bitrix\ABTest\EventHandler::onGetCurrentSiteTemplate(object)
	
#15: call_user_func_array(array, array)
	/home/bitrix/www/bitrix/modules/main/lib/eventmanager.php:435
#16: Bitrix\Main\EventManager->sendToEventHandler(array, object)
	/home/bitrix/www/bitrix/modules/main/lib/eventmanager.php:371
#17: Bitrix\Main\EventManager->send(object)
	/home/bitrix/www/bitrix/modules/main/lib/event.php:142
#18: Bitrix\Main\Event->send()
	/home/bitrix/www/bitrix/modules/main/classes/general/main.php:4529
#19: CAllSite::GetCurTemplate()
	/home/bitrix/www/bitrix/modules/main/include.php:535
#20: require_once(string)
	/home/bitrix/www/bitrix/modules/main/include/prolog_before.php:14
#21: require_once(string)
	/home/bitrix/www/bitrix/modules/main/include/prolog.php:10
#22: require_once(string)
	/home/bitrix/www/bitrix/header.php:3
#23: require(string)
	/home/bitrix/www/catalog/index.php:32
#24: include_once(string)
	/home/bitrix/www/bitrix/modules/main/include/urlrewrite.php:159
#25: include_once(string)
	/home/bitrix/www/bitrix/urlrewrite.php:2