[Bitrix\Main\DB\SqlQueryException] 
Mysql query error: (2006) MySQL server has gone away (400)

				SELECT
					`CONDITION`,
					TEMPLATE
				FROM
					b_site_template
				WHERE
					SITE_ID='s1'
				ORDER BY
					CASE
						WHEN IFNULL(LENGTH(`CONDITION`), 0)=0 THEN 2
						ELSE 1
					END,
					SORT
				
/home/bitrix/www/bitrix/modules/main/lib/db/mysqliconnection.php:137
#0: Bitrix\Main\DB\MysqliConnection->queryInternal(string, array, NULL)
	/home/bitrix/www/bitrix/modules/main/lib/db/connection.php:329
#1: Bitrix\Main\DB\Connection->query(string)
	/home/bitrix/www/bitrix/modules/main/classes/general/main.php:4566
#2: CAllSite::GetCurTemplate()
	/home/bitrix/www/bitrix/modules/main/include.php:524
#3: require_once(string)
	/home/bitrix/www/bitrix/modules/main/include/prolog_before.php:14
#4: require_once(string)
	/home/bitrix/www/bitrix/modules/main/include/prolog.php:10
#5: require_once(string)
	/home/bitrix/www/bitrix/header.php:1
#6: require(string)
	/home/bitrix/www/ru/products/detail.php:1