[Error] 
Failed to open session: user (path: /tmp/php_sessions/ext_www/komfortel.com) (0)
/home/bitrix/ext_www/shared/bitrix/modules/security/classes/general/session.php:55
#0: session_regenerate_id()
	/home/bitrix/ext_www/shared/bitrix/modules/security/classes/general/session.php:55
#1: CSecuritySession::UpdateSessID()
	/home/bitrix/ext_www/shared/bitrix/modules/main/classes/general/module.php:465
#2: ExecuteModuleEventEx(array)
	/home/bitrix/ext_www/shared/bitrix/modules/main/include.php:303
#3: require_once(string)
	/home/bitrix/ext_www/shared/bitrix/modules/main/include/prolog_before.php:14
#4: require_once(string)
	/home/bitrix/ext_www/shared/bitrix/modules/main/include/prolog.php:10
#5: require_once(string)
	/home/bitrix/ext_www/shared/bitrix/header.php:1
#6: require(string)
	/home/bitrix/ext_www/komfortel.com/catalog/index.php:2
#7: include_once(string)
	/home/bitrix/ext_www/shared/bitrix/modules/main/include/urlrewrite.php:159
#8: include_once(string)
	/home/bitrix/ext_www/shared/bitrix/urlrewrite.php:2

Fatal error: Uncaught Bitrix\Main\DB\SqlQueryException: Mysql query error: (2006) MySQL server has gone away in /home/bitrix/ext_www/shared/bitrix/modules/main/lib/db/mysqliconnection.php:137 Stack trace: #0 /home/bitrix/ext_www/shared/bitrix/modules/main/lib/db/connection.php(330): Bitrix\Main\DB\MysqliConnection->queryInternal('DO RELEASE_LOCK...', Array, NULL) #1 /home/bitrix/ext_www/shared/bitrix/modules/main/lib/db/connection.php(379): Bitrix\Main\DB\Connection->query('DO RELEASE_LOCK...', NULL) #2 /home/bitrix/ext_www/shared/bitrix/modules/security/lib/session.php(213): Bitrix\Main\DB\Connection->queryExecute('DO RELEASE_LOCK...') #3 /home/bitrix/ext_www/shared/bitrix/modules/security/classes/general/session_db.php(36): Bitrix\Security\SessionTable::unlock('i6mb8medOIiY8c3...') #4 /home/bitrix/ext_www/shared/bitrix/modules/security/classes/general/session_handler.php(18): CSecuritySessionDB::close() #5 [internal function]: CSecuritySessionHandler->close() #6 {main} thrown in /home/bitrix/ext_www/shared/bitrix/modules/main/lib/db/mysqliconnection.php on line 137