[Bitrix\Main\DB\SqlQueryException] 
Mysql query error: (2006) 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`,
	`catalog_catalog_iblock_iblock`.`ID` AS `UALIAS_0`
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` = 33
/home/bitrix/www/bitrix/modules/main/lib/db/mysqliconnection.php:137
#0: Bitrix\Main\DB\MysqliConnection->queryInternal
	/home/bitrix/www/bitrix/modules/main/lib/db/connection.php:330
#1: Bitrix\Main\DB\Connection->query
	/home/bitrix/www/bitrix/modules/main/lib/orm/query/query.php:3357
#2: Bitrix\Main\ORM\Query\Query->query
	/home/bitrix/www/bitrix/modules/main/lib/orm/query/query.php:825
#3: Bitrix\Main\ORM\Query\Query->exec
	/home/bitrix/www/bitrix/modules/main/lib/orm/data/datamanager.php:500
#4: Bitrix\Main\ORM\Data\DataManager::getList
	/home/bitrix/www/bitrix/modules/catalog/general/catalog_sku.php:143
#5: CAllCatalogSku::GetInfoByProductIBlock
	/home/bitrix/www/bitrix/components/w247.catalogs/catalog.smart.filter/class.php:128
#6: CBitrixCatalogSmartFilter->executeComponent
	/home/bitrix/www/bitrix/modules/main/classes/general/component.php:656
#7: CBitrixComponent->includeComponent
	/home/bitrix/www/bitrix/modules/main/classes/general/main.php:1046
#8: CAllMain->IncludeComponent
	/home/bitrix/www/local/components/w247.catalogs/catalog/templates/.default/section.php:2393
#9: include(string)
	/home/bitrix/www/bitrix/modules/main/classes/general/component_template.php:789
#10: CBitrixComponentTemplate->__IncludePHPTemplate
	/home/bitrix/www/bitrix/modules/main/classes/general/component_template.php:884
#11: CBitrixComponentTemplate->IncludeTemplate
	/home/bitrix/www/bitrix/modules/main/classes/general/component.php:764
#12: CBitrixComponent->showComponentTemplate
	/home/bitrix/www/bitrix/modules/main/classes/general/component.php:712
#13: CBitrixComponent->includeComponentTemplate
	/home/bitrix/www/local/components/w247.catalogs/catalog/class.php:268
#14: W247CatalogsComponent->executeComponent
	/home/bitrix/www/bitrix/modules/main/classes/general/component.php:656
#15: CBitrixComponent->includeComponent
	/home/bitrix/www/bitrix/modules/main/classes/general/main.php:1046
#16: CAllMain->IncludeComponent
	/home/bitrix/www/catalog/index.php:234
#17: include_once(string)
	/home/bitrix/www/bitrix/modules/main/include/urlrewrite.php:159
#18: include_once(string)
	/home/bitrix/www/bitrix/urlrewrite.php:2