[Bitrix\Main\DB\SqlQueryException] 
Mysql query error: (2006) MySQL server has gone away (400)
SELECT * FROM `b_sec_session` LIMIT 0
/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/mysqlcommonconnection.php:104
#1: Bitrix\Main\DB\MysqlCommonConnection->getTableFields
	/home/bitrix/www/bitrix/modules/main/lib/db/connection.php:779
#2: Bitrix\Main\DB\Connection->getTableField
	/home/bitrix/www/bitrix/modules/main/lib/db/sqlhelper.php:406
#3: Bitrix\Main\DB\SqlHelper->prepareAssignment
	/home/bitrix/www/bitrix/modules/main/lib/orm/data/datamanager.php:1619
#4: Bitrix\Main\ORM\Data\DataManager::delete
	/home/bitrix/www/bitrix/modules/security/classes/general/session_db.php:100
#5: CSecuritySessionDB::write
	/home/bitrix/www/bitrix/modules/security/classes/general/session_handler.php:28
#6: CSecuritySessionHandler->write
	
#7: session_regenerate_id
	/home/bitrix/www/bitrix/modules/security/classes/general/session.php:55
#8: CSecuritySession::UpdateSessID
	/home/bitrix/www/bitrix/modules/main/classes/general/module.php:465
#9: ExecuteModuleEventEx
	/home/bitrix/www/bitrix/modules/main/include.php:303
#10: require_once(string)
	/home/bitrix/www/bitrix/modules/main/include/prolog_before.php:14
#11: require_once(string)
	/home/bitrix/www/bitrix/modules/main/include/prolog.php:10
#12: require_once(string)
	/home/bitrix/www/bitrix/header.php:1
#13: require(string)
	/home/bitrix/www/pokupka-v-kredit/index.php:2