[Bitrix\Main\DB\ConnectionException] 
Mysql connect error [localhost]: (2006) MySQL server has gone away (400)
/var/www/vhosts/tdabris.ru/httpdocs/bitrix/modules/main/lib/db/mysqliconnection.php:65
#0: Bitrix\Main\DB\MysqliConnection->connectInternal
	/var/www/vhosts/tdabris.ru/httpdocs/bitrix/modules/main/lib/db/mysqliconnection.php:122
#1: Bitrix\Main\DB\MysqliConnection->queryInternal
	/var/www/vhosts/tdabris.ru/httpdocs/bitrix/modules/main/lib/db/connection.php:330
#2: Bitrix\Main\DB\Connection->query
	/var/www/vhosts/tdabris.ru/httpdocs/bitrix/modules/main/lib/modulemanager.php:20
#3: Bitrix\Main\ModuleManager::getInstalledModules
	/var/www/vhosts/tdabris.ru/httpdocs/bitrix/modules/main/lib/loader.php:99
#4: Bitrix\Main\Loader::includeModule
	/var/www/vhosts/tdabris.ru/httpdocs/bitrix/modules/main/lib/data/connectionpool.php:308
#5: Bitrix\Main\Data\ConnectionPool->createSlaveConnection
	/var/www/vhosts/tdabris.ru/httpdocs/bitrix/modules/main/lib/data/connectionpool.php:247
#6: Bitrix\Main\Data\ConnectionPool->getSlaveConnection
	/var/www/vhosts/tdabris.ru/httpdocs/bitrix/modules/main/classes/mysql/database.php:128
#7: CDatabaseMysql->Query
	/var/www/vhosts/tdabris.ru/httpdocs/bitrix/modules/main/classes/mysql/main.php:97
#8: CMain->GetLang
	/var/www/vhosts/tdabris.ru/httpdocs/bitrix/modules/main/include.php:49
#9: require_once(string)
	/var/www/vhosts/tdabris.ru/httpdocs/bitrix/modules/main/include/prolog_before.php:14
#10: require_once(string)
	/var/www/vhosts/tdabris.ru/httpdocs/bitrix/modules/main/include/prolog.php:10
#11: require_once(string)
	/var/www/vhosts/tdabris.ru/httpdocs/bitrix/header.php:1
#12: require(string)
	/var/www/vhosts/tdabris.ru/httpdocs/izdatelstvo/index.php:2