[Bitrix\Main\DB\SqlQueryException] 
Mysql query error: (2006) MySQL server has gone away (400)
SELECT 
	`security_session`.`SESSION_DATA` AS `SESSION_DATA`,
	`security_session`.`SESSION_ID` AS `UALIAS_0`
FROM `b_sec_session` `security_session` 

WHERE `security_session`.`SESSION_ID` = 'nXflMSvZqLesjkVjPVZcuHm9g13lkwbg'
LIMIT 0, 1

/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:410
#5: Bitrix\Main\ORM\Data\DataManager::getRow(array)
	/home/bitrix/www/bitrix/modules/security/classes/general/session_db.php:58
#6: CSecuritySessionDB::read(string)
	/home/bitrix/www/bitrix/modules/security/classes/general/session_handler.php:23
#7: CSecuritySessionHandler->read(string)
	
#8: session_start()
	/home/bitrix/www/bitrix/modules/main/lib/session/session.php:130
#9: Bitrix\Main\Session\Session->start()
	/home/bitrix/www/bitrix/modules/main/lib/session/kernelsessionproxy.php:52
#10: Bitrix\Main\Session\KernelSessionProxy->start()
	/home/bitrix/www/bitrix/modules/main/include.php:299
#11: require_once(string)
	/home/bitrix/www/bitrix/modules/main/include/prolog_before.php:14
#12: require_once(string)
	/home/bitrix/www/bitrix/modules/main/include/prolog.php:10
#13: require_once(string)
	/home/bitrix/www/bitrix/header.php:1
#14: require(string)
	/home/bitrix/www/personal/cart/index.php:2