[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`
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`.`IBLOCK_ID` = 20
AND (`catalog_catalog_iblock`.`PRODUCT_IBLOCK_ID` IS NOT NULL AND `catalog_catalog_iblock`.`PRODUCT_IBLOCK_ID` <> 0)
/home/bitrix/www/bitrix/modules/main/lib/db/mysqliconnection.php:137
#0: Bitrix\Main\DB\MysqliConnection->queryInternal(string, array, NULL)
	/home/bitrix/www/bitrix/modules/main/lib/db/connection.php:330
#1: Bitrix\Main\DB\Connection->query(string)
	/home/bitrix/www/bitrix/modules/main/lib/entity/query.php:3038
#2: Bitrix\Main\Entity\Query->query(string)
	/home/bitrix/www/bitrix/modules/main/lib/entity/query.php:797
#3: Bitrix\Main\Entity\Query->exec()
	/home/bitrix/www/bitrix/modules/main/lib/entity/datamanager.php:290
#4: Bitrix\Main\Entity\DataManager::getList(array)
	/home/bitrix/www/bitrix/modules/catalog/general/catalog_sku.php:113
#5: CAllCatalogSku::GetInfoByOfferIBlock(integer)
	/home/bitrix/www/bitrix/modules/catalog/general/discount.php:1194
#6: CAllCatalogDiscount::GetDiscount(integer, integer, array, array, string, string, array)
	/home/bitrix/www/local/components/sh/catalogProducts/class.php:2053
#7: CCatalogProductListComp->correctPrice()
	/home/bitrix/www/local/components/sh/catalogProducts/component.php:781
#8: include(string)
	/home/bitrix/www/bitrix/modules/main/classes/general/component.php:594
#9: CBitrixComponent->__includeComponent()
	/home/bitrix/www/local/components/lib/baseComponent/class.php:371
#10: CShBaseComponent->executeComponent()
	/home/bitrix/www/bitrix/modules/main/classes/general/component.php:638
#11: CBitrixComponent->includeComponent(string, array, NULL)
	/home/bitrix/www/bitrix/modules/main/classes/general/main.php:1041
#12: CAllMain->IncludeComponent(string, string, array)
	/home/bitrix/www/catalog/index.php:29
#13: include_once(string)
	/home/bitrix/www/bitrix/modules/main/include/urlrewrite.php:159
#14: include_once(string)
	/home/bitrix/www/bitrix/urlrewrite.php:2