[Bitrix\Main\DB\SqlQueryException] 
Mysql query error: (2006) MySQL server has gone away (400)
SET NAMES 'utf8'
/home/bitrix/www/bitrix/modules/main/lib/db/mysqliconnection.php:137
#0: Bitrix\Main\DB\MysqliConnection->queryInternal
	/home/bitrix/www/bitrix/modules/main/lib/db/connection.php:330
#1: Bitrix\Main\DB\Connection->query
	/home/bitrix/www/bitrix/modules/main/lib/db/connection.php:379
#2: Bitrix\Main\DB\Connection->queryExecute
	/home/bitrix/www/bitrix/php_interface/after_connect_d7.php:3
#3: include(string)
	/home/bitrix/www/bitrix/modules/main/lib/db/connection.php:1008
#4: Bitrix\Main\DB\Connection->afterConnected
	/home/bitrix/www/bitrix/modules/main/lib/db/mysqliconnection.php:81
#5: Bitrix\Main\DB\MysqliConnection->connectInternal
	/home/bitrix/www/bitrix/modules/main/lib/db/mysqliconnection.php:122
#6: Bitrix\Main\DB\MysqliConnection->queryInternal
	/home/bitrix/www/bitrix/modules/main/lib/db/connection.php:330
#7: Bitrix\Main\DB\Connection->query
	/home/bitrix/www/bitrix/modules/main/lib/db/connection.php:358
#8: Bitrix\Main\DB\Connection->queryScalar
	/home/bitrix/www/bitrix/modules/security/lib/session.php:114
#9: Bitrix\Security\SessionTable::lock
	/home/bitrix/www/bitrix/modules/security/classes/general/session_db.php:52
#10: CSecuritySessionDB::read
	/home/bitrix/www/bitrix/modules/security/classes/general/session_handler.php:23
#11: CSecuritySessionHandler->read
	
#12: session_start
	/home/bitrix/www/bitrix/modules/main/lib/session/session.php:130
#13: Bitrix\Main\Session\Session->start
	/home/bitrix/www/bitrix/modules/main/lib/session/kernelsessionproxy.php:52
#14: Bitrix\Main\Session\KernelSessionProxy->start
	/home/bitrix/www/bitrix/modules/main/include.php:299
#15: require_once(string)
	/home/bitrix/www/bitrix/modules/main/include/prolog_before.php:14
#16: require_once(string)
	/home/bitrix/www/bitrix/modules/main/include/prolog.php:10
#17: require_once(string)
	/home/bitrix/www/bitrix/header.php:1
#18: require(string)
	/home/bitrix/www/personal/cart/index.php:2