[Bitrix\Main\DB\SqlQueryException] 
Mysql query error: (2006) MySQL server has gone away (400)
SELECT 
	`iblock_element`.`ID` AS `ID`,
	`iblock_element`.`IBLOCK_ID` AS `IBLOCK_ID`,
	`iblock_element`.`IBLOCK_SECTION_ID` AS `IBLOCK_SECTION_ID`
FROM `b_iblock_element` `iblock_element` 

WHERE UPPER(`iblock_element`.`CODE`) like upper('acer-aspire-5-15-6-intel-core-i3-7100u-2-4ghz-8gb-1tb-hdd')
AND UPPER(`iblock_element`.`ACTIVE`) like upper('Y')
LIMIT 0, 1

/home/bitrix/dev.expertology.ru/www/bitrix/modules/main/lib/db/mysqliconnection.php:137
#0: Bitrix\Main\DB\MysqliConnection->queryInternal(string, array, NULL)
	/home/bitrix/dev.expertology.ru/www/bitrix/modules/main/lib/db/connection.php:330
#1: Bitrix\Main\DB\Connection->query(string)
	/home/bitrix/dev.expertology.ru/www/bitrix/modules/main/lib/entity/query.php:3038
#2: Bitrix\Main\Entity\Query->query(string)
	/home/bitrix/dev.expertology.ru/www/bitrix/modules/main/lib/entity/query.php:797
#3: Bitrix\Main\Entity\Query->exec()
	/home/bitrix/dev.expertology.ru/www/bitrix/modules/main/lib/entity/datamanager.php:290
#4: Bitrix\Main\Entity\DataManager::getList(array)
	/home/bitrix/dev.expertology.ru/www/bitrix/modules/main/lib/entity/datamanager.php:200
#5: Bitrix\Main\Entity\DataManager::getRow(array)
	/home/bitrix/dev.expertology.ru/www/local/php_interface/router.php:94
#6: Router->processCode(string)
	/home/bitrix/dev.expertology.ru/www/router.php:13
#7: include_once(string)
	/home/bitrix/dev.expertology.ru/www/bitrix/modules/main/include/urlrewrite.php:159
#8: include_once(string)
	/home/bitrix/dev.expertology.ru/www/404.php:2