[Bitrix\Main\DB\ConnectionException] 
Mysql connect error [localhost]: (2006) MySQL server has gone away (400)
/var/www/clients/client0/web4/web/bitrix/modules/main/lib/db/mysqliconnection.php:65
#0: Bitrix\Main\DB\MysqliConnection->connectInternal()
	/var/www/clients/client0/web4/web/bitrix/modules/main/lib/db/mysqliconnection.php:122
#1: Bitrix\Main\DB\MysqliConnection->queryInternal(string, array, NULL)
	/var/www/clients/client0/web4/web/bitrix/modules/main/lib/db/connection.php:330
#2: Bitrix\Main\DB\Connection->query(string)
	/var/www/clients/client0/web4/web/bitrix/modules/main/lib/web/cookie.php:218
#3: Bitrix\Main\Web\Cookie::getCookieDomain()
	/var/www/clients/client0/web4/web/bitrix/modules/main/include.php:280
#4: require_once(string)
	/var/www/clients/client0/web4/web/bitrix/modules/main/include/prolog_before.php:14
#5: require_once(string)
	/var/www/clients/client0/web4/web/bitrix/modules/main/include/prolog.php:10
#6: require_once(string)
	/var/www/clients/client0/web4/web/bitrix/header.php:1
#7: require(string)
	/var/www/clients/client0/web4/web/ideas/index.php:2
#8: include_once(string)
	/var/www/clients/client0/web4/web/bitrix/modules/main/include/urlrewrite.php:162
#9: include_once(string)
	/var/www/clients/client0/web4/web/bitrix/urlrewrite.php:2