[Bitrix\Main\DB\SqlQueryException] 
Mysql query error: MySQL server has gone away (400)
SELECT 
	`iblock_section`.`ID` AS `ID`,
	`iblock_section`.`XML_ID` AS `XML_ID`
FROM `b_iblock_section` `iblock_section` 

WHERE `iblock_section`.`IBLOCK_ID` = 47
AND `iblock_section`.`DEPTH_LEVEL` = 1
/home/bitrix/www/bitrix/modules/main/lib/db/mysqlconnection.php:87
#0: Bitrix\Main\DB\MysqlConnection->queryInternal(string, array, NULL)
	/home/bitrix/www/bitrix/modules/main/lib/db/connection.php:284
#1: Bitrix\Main\DB\Connection->query(string)
	/home/bitrix/www/bitrix/modules/main/lib/entity/query.php:1735
#2: Bitrix\Main\Entity\Query->query(string)
	/home/bitrix/www/bitrix/modules/main/lib/entity/query.php:450
#3: Bitrix\Main\Entity\Query->exec()
	/home/bitrix/www/bitrix/modules/main/lib/entity/datamanager.php:230
#4: Bitrix\Main\Entity\DataManager::getList(array)
	/home/bitrix/www/bitrix/templates/office_1/header.php:59
#5: include_once(string)
	/home/bitrix/www/bitrix/modules/main/include/prolog_after.php:86
#6: require(string)
	/home/bitrix/www/bitrix/modules/main/include/prolog.php:12
#7: require_once(string)
	/home/bitrix/www/bitrix/header.php:1
#8: require(string)
	/home/bitrix/www/catalog/index.php:2
#9: include_once(string)
	/home/bitrix/www/bitrix/modules/main/include/urlrewrite.php:155
#10: include_once(string)
	/home/bitrix/www/bitrix/urlrewrite.php:2