[Bitrix\Main\DB\SqlQueryException] 
Mysql query error: (2006) MySQL server has gone away (400)
SELECT 
	`main_user_field`.`ID` AS `ID`,
	`main_user_field`.`ENTITY_ID` AS `ENTITY_ID`,
	`main_user_field`.`FIELD_NAME` AS `FIELD_NAME`,
	`main_user_field`.`USER_TYPE_ID` AS `USER_TYPE_ID`,
	`main_user_field`.`XML_ID` AS `XML_ID`,
	`main_user_field`.`SORT` AS `SORT`,
	`main_user_field`.`MULTIPLE` AS `MULTIPLE`
FROM `b_user_field` `main_user_field` 

WHERE `main_user_field`.`ENTITY_ID` = 'PRODUCT'
ORDER BY `SORT` ASC, `ID` ASC
/var/www/pin-avto/data/www/pin-avto2.ru/bitrix/modules/main/lib/db/mysqliconnection.php:153
#0: Bitrix\Main\DB\MysqliConnection->queryInternal(string, array, NULL)
	/var/www/pin-avto/data/www/pin-avto2.ru/bitrix/modules/main/lib/db/connection.php:327
#1: Bitrix\Main\DB\Connection->query(string)
	/var/www/pin-avto/data/www/pin-avto2.ru/bitrix/modules/main/lib/orm/query/query.php:3537
#2: Bitrix\Main\ORM\Query\Query->query(string)
	/var/www/pin-avto/data/www/pin-avto2.ru/bitrix/modules/main/lib/orm/query/query.php:952
#3: Bitrix\Main\ORM\Query\Query->exec()
	/var/www/pin-avto/data/www/pin-avto2.ru/bitrix/modules/main/lib/orm/data/datamanager.php:513
#4: Bitrix\Main\ORM\Data\DataManager::getList(array)
	/var/www/pin-avto/data/www/pin-avto2.ru/bitrix/modules/catalog/general/querybuilder.php:839
#5: CProductQueryBuilder::getProductUserFields()
	/var/www/pin-avto/data/www/pin-avto2.ru/bitrix/modules/catalog/general/querybuilder.php:642
#6: CProductQueryBuilder::initEntityFields()
	/var/www/pin-avto/data/www/pin-avto2.ru/bitrix/modules/catalog/general/querybuilder.php:104
#7: CProductQueryBuilder::isValidField(string)
	/var/www/pin-avto/data/www/pin-avto2.ru/bitrix/modules/iblock/classes/general/iblockelement.php:2777
#8: CAllIBlockElement->PrepareGetList(array, array, array, NULL, NULL, array, NULL, NULL, NULL, boolean, NULL, array, array, array)
	/var/www/pin-avto/data/www/pin-avto2.ru/bitrix/modules/iblock/classes/mysql/iblockelement.php:326
#9: CIBlockElement->prepareSql(array, array, boolean, array)
	/var/www/pin-avto/data/www/pin-avto2.ru/bitrix/modules/iblock/classes/mysql/iblockelement.php:684
#10: CIBlockElement::GetList(array, array, boolean, boolean, array)
	/var/www/pin-avto/data/www/pin-avto2.ru/bitrix/templates/pin_avto/header.php:315
#11: include_once(string)
	/var/www/pin-avto/data/www/pin-avto2.ru/bitrix/modules/main/include/prolog_after.php:110
#12: require(string)
	/var/www/pin-avto/data/www/pin-avto2.ru/bitrix/modules/main/include/prolog.php:11
#13: require_once(string)
	/var/www/pin-avto/data/www/pin-avto2.ru/bitrix/header.php:1
#14: require(string)
	/var/www/pin-avto/data/www/stavropol.pin-avto.ru/catalog/index.php:2
#15: include_once(string)
	/var/www/pin-avto/data/www/pin-avto2.ru/bitrix/modules/main/include/urlrewrite.php:184
#16: include_once(string)
	/var/www/pin-avto/data/www/pin-avto2.ru/bitrix/urlrewrite.php:4
----------