[Bitrix\Main\DB\SqlQueryException] 
Mysql query error: MySQL server has gone away (400)
SELECT 
	`catalog_catalog_iblock`.`IBLOCK_ID` AS `IBLOCK_ID`,
	`catalog_catalog_iblock`.`PRODUCT_IBLOCK_ID` AS `PRODUCT_IBLOCK_ID`,
	`catalog_catalog_iblock`.`SKU_PROPERTY_ID` AS `SKU_PROPERTY_ID`,
	`catalog_catalog_iblock_iblock`.`VERSION` AS `VERSION`
FROM `b_catalog_iblock` `catalog_catalog_iblock` 
INNER JOIN `b_iblock` `catalog_catalog_iblock_iblock` ON `catalog_catalog_iblock`.`IBLOCK_ID` = `catalog_catalog_iblock_iblock`.`ID`
WHERE `catalog_catalog_iblock`.`PRODUCT_IBLOCK_ID` = 3
/home/bitrix/www/bitrix/modules/main/lib/db/mysqlconnection.php:104
#0: Bitrix\Main\DB\MysqlConnection->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/lib/entity/query.php:1757
#2: Bitrix\Main\Entity\Query->query(string)
	/home/bitrix/www/bitrix/modules/main/lib/entity/query.php:454
#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/modules/catalog/general/catalog_sku.php:146
#5: CAllCatalogSKU::GetInfoByProductIBlock(integer)
	/home/bitrix/www/bitrix/modules/iblock/lib/propertyindex/facet.php:45
#6: Bitrix\Iblock\PropertyIndex\Facet->__construct(integer)
	/home/bitrix/www/bitrix/modules/iblock/lib/propertyindex/querybuilder.php:28
#7: Bitrix\Iblock\PropertyIndex\QueryBuilder->__construct(integer)
	/home/bitrix/www/bitrix/modules/iblock/classes/general/iblockelement.php:639
#8: CAllIBlockElement->MkFilter(array, array, array)
	/home/bitrix/www/bitrix/modules/iblock/classes/general/iblockelement.php:3011
#9: CAllIBlockElement->PrepareGetList(array, array, NULL, boolean, array, string, array, array, NULL, NULL, array, boolean, string, array, array, array, NULL, array, NULL, array, array, NULL)
	/home/bitrix/www/bitrix/modules/iblock/classes/mysql/iblockelement.php:361
#10: CIBlockElement->GetList(array, array, boolean, boolean, array)
	/home/bitrix/www/bitrix/php_interface/init.php:51
#11: include_once(string)
	/home/bitrix/www/bitrix/modules/main/include.php:233
#12: require_once(string)
	/home/bitrix/www/bitrix/modules/main/include/prolog_before.php:14
#13: require_once(string)
	/home/bitrix/www/bitrix/modules/main/include/prolog.php:10
#14: require_once(string)
	/home/bitrix/www/bitrix/header.php:1
#15: require(string)
	/home/bitrix/www/catalog/detail.php:1
#16: include_once(string)
	/home/bitrix/www/bitrix/modules/main/include/urlrewrite.php:159
#17: include_once(string)
	/home/bitrix/www/bitrix/urlrewrite.php:2