[Bitrix\Main\DB\SqlQueryException] 
Mysql query error: (2006) MySQL server has gone away (400)
SELECT GET_LOCK("a8757d1916c89dc70f5bf599aaf13901", 60)
LIMIT 0, 1

/var/www/etalon69/data/www/etalon69.ru/bitrix/modules/main/lib/db/mysqliconnection.php:137
#0: Bitrix\Main\DB\MysqliConnection->queryInternal(string, NULL, NULL)
	/var/www/etalon69/data/www/etalon69.ru/bitrix/modules/main/lib/db/connection.php:329
#1: Bitrix\Main\DB\Connection->query(string, NULL, integer, integer)
	/var/www/etalon69/data/www/etalon69.ru/bitrix/modules/main/lib/db/connection.php:357
#2: Bitrix\Main\DB\Connection->queryScalar(string)
	/var/www/etalon69/data/www/etalon69.ru/bitrix/modules/security/lib/session.php:110
#3: Bitrix\Security\SessionTable::lock(string, integer)
	/var/www/etalon69/data/www/etalon69.ru/bitrix/modules/security/classes/general/session_db.php:52
#4: CSecuritySessionDB::read(string)
	
#5: session_start()
	/var/www/etalon69/data/www/etalon69.ru/bitrix/modules/main/include.php:277
#6: require_once(string)
	/var/www/etalon69/data/www/etalon69.ru/bitrix/modules/main/include/prolog_before.php:14
#7: require_once(string)
	/var/www/etalon69/data/www/etalon69.ru/bitrix/modules/main/include/prolog.php:10
#8: require_once(string)
	/var/www/etalon69/data/www/etalon69.ru/bitrix/header.php:1
#9: require(string)
	/var/www/etalon69/data/www/etalon69.ru/catalog/index.php:2
#10: include_once(string)
	/var/www/etalon69/data/www/etalon69.ru/bitrix/modules/main/include/urlrewrite.php:159
#11: include_once(string)
	/var/www/etalon69/data/www/etalon69.ru/bitrix/urlrewrite.php:2

Fatal error: Uncaught Bitrix\Main\DB\SqlQueryException: Mysql query error: (2006) MySQL server has gone away in /var/www/etalon69/data/www/etalon69.ru/bitrix/modules/main/lib/db/mysqliconnection.php:137 Stack trace: #0 /var/www/etalon69/data/www/etalon69.ru/bitrix/modules/main/lib/db/mysqlcommonconnection.php(132): Bitrix\Main\DB\MysqliConnection->queryInternal('SELECT * FROM `...') #1 /var/www/etalon69/data/www/etalon69.ru/bitrix/modules/main/lib/db/connection.php(715): Bitrix\Main\DB\MysqlCommonConnection->getTableFields('b_sec_session') #2 /var/www/etalon69/data/www/etalon69.ru/bitrix/modules/main/lib/db/sqlhelper.php(387): Bitrix\Main\DB\Connection->getTableField('b_sec_session', 'SESSION_ID') #3 /var/www/etalon69/data/www/etalon69.ru/bitrix/modules/main/lib/entity/datamanager.php(918): Bitrix\Main\DB\SqlHelper->prepareAssignment('b_sec_session', 'SESSION_ID', 'kYoT4MlDmMCGaJ1...') #4 /var/www/etalon69/data/www/etalon69.ru/bitrix/modules/security/classes/general/session_db.php(92): Bitrix\Main\Entity\DataManager::dele in /var/www/etalon69/data/www/etalon69.ru/bitrix/modules/main/lib/db/mysqliconnection.php on line 137