[Bitrix\Main\DB\ConnectionException] 
Mysql connect error [localhost]: (2006) MySQL server has gone away (400)
/home/bitrix/ext_www/clever.estate/bitrix/modules/main/lib/db/mysqliconnection.php:65
#0: Bitrix\Main\DB\MysqliConnection->connectInternal()
	/home/bitrix/ext_www/clever.estate/bitrix/modules/main/lib/db/mysqliconnection.php:122
#1: Bitrix\Main\DB\MysqliConnection->queryInternal(string, NULL, NULL)
	/home/bitrix/ext_www/clever.estate/bitrix/modules/main/lib/db/connection.php:329
#2: Bitrix\Main\DB\Connection->query(string, NULL, integer, integer)
	/home/bitrix/ext_www/clever.estate/bitrix/modules/main/lib/db/connection.php:357
#3: Bitrix\Main\DB\Connection->queryScalar(string)
	/home/bitrix/ext_www/clever.estate/bitrix/modules/security/lib/session.php:110
#4: Bitrix\Security\SessionTable::lock(string, integer)
	/home/bitrix/ext_www/clever.estate/bitrix/modules/security/classes/general/session_db.php:52
#5: CSecuritySessionDB::read(string)
	
#6: session_start()
	/home/bitrix/ext_www/clever.estate/bitrix/modules/main/include.php:286
#7: require_once(string)
	/home/bitrix/ext_www/clever.estate/bitrix/modules/main/include/prolog_before.php:14
#8: require_once(string)
	/home/bitrix/ext_www/clever.estate/bitrix/modules/main/include/prolog.php:10
#9: require_once(string)
	/home/bitrix/ext_www/clever.estate/bitrix/header.php:1
#10: require(string)
	/home/bitrix/ext_www/clever.estate/brands/index.php:1
#11: include_once(string)
	/home/bitrix/ext_www/clever.estate/bitrix/modules/main/include/urlrewrite.php:159
#12: include_once(string)
	/home/bitrix/ext_www/clever.estate/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/clever.estate/bitrix/modules/main/lib/db/mysqliconnection.php:137 Stack trace: #0 /home/bitrix/ext_www/clever.estate/bitrix/modules/main/lib/db/connection.php(329): Bitrix\Main\DB\MysqliConnection->queryInternal('\n\t\t\t\tSELECT FRO...', Array, NULL) #1 /home/bitrix/ext_www/clever.estate/bitrix/modules/main/lib/eventmanager.php(242): Bitrix\Main\DB\Connection->query('\n\t\t\t\tSELECT FRO...') #2 /home/bitrix/ext_www/clever.estate/bitrix/modules/main/lib/eventmanager.php(340): Bitrix\Main\EventManager->loadEventHandlers() #3 /home/bitrix/ext_www/clever.estate/bitrix/modules/main/lib/eventmanager.php(375): Bitrix\Main\EventManager->findEventHandlers('security', 'SessionOnBefore...', NULL) #4 /home/bitrix/ext_www/clever.estate/bitrix/modules/main/lib/event.php(112): Bitrix\Main\EventManager->send(Object(Bitrix\Main\Entity\Event)) #5 /home/bitrix/ext_www/clever.estate/bitrix/modules/main/lib/en in /home/bitrix/ext_www/clever.estate/bitrix/modules/main/lib/db/mysqliconnection.php on line 137