[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`.`VAT_ID` AS `VAT_ID`,
	`catalog_catalog_iblock`.`YANDEX_EXPORT` AS `YANDEX_EXPORT`,
	`catalog_catalog_iblock`.`SUBSCRIPTION` AS `SUBSCRIPTION`
FROM `b_catalog_iblock` `catalog_catalog_iblock` 

WHERE (
	`catalog_catalog_iblock`.`IBLOCK_ID` = 1
	OR `catalog_catalog_iblock`.`PRODUCT_IBLOCK_ID` = 1
)
/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:329
#1: Bitrix\Main\DB\Connection->query(string)
	/home/bitrix/www/bitrix/modules/main/lib/entity/query.php:1924
#2: Bitrix\Main\Entity\Query->query(string)
	/home/bitrix/www/bitrix/modules/main/lib/entity/query.php:505
#3: Bitrix\Main\Entity\Query->exec()
	/home/bitrix/www/bitrix/modules/main/lib/entity/datamanager.php:255
#4: Bitrix\Main\Entity\DataManager::getList(array)
	/home/bitrix/www/bitrix/modules/catalog/general/catalog_sku.php:212
#5: CAllCatalogSku::GetInfoByIBlock(integer)
	/home/bitrix/www/bitrix/components/bitrix/catalog.element/component.php:487
#6: include(string)
	/home/bitrix/www/bitrix/modules/main/classes/general/component.php:548
#7: CBitrixComponent->__includeComponent()
	/home/bitrix/www/bitrix/modules/main/classes/general/component.php:600
#8: CBitrixComponent->includeComponent(string, array, object)
	/home/bitrix/www/bitrix/modules/main/classes/general/main.php:1035
#9: CAllMain->IncludeComponent(string, string, array, object)
	/home/bitrix/www/bitrix/templates/.default/components/bitrix/catalog/template1/element.php:150
#10: include(string)
	/home/bitrix/www/bitrix/modules/main/classes/general/component_template.php:714
#11: CBitrixComponentTemplate->__IncludePHPTemplate(array, array, string)
	/home/bitrix/www/bitrix/modules/main/classes/general/component_template.php:806
#12: CBitrixComponentTemplate->IncludeTemplate(array)
	/home/bitrix/www/bitrix/modules/main/classes/general/component.php:681
#13: CBitrixComponent->showComponentTemplate()
	/home/bitrix/www/bitrix/modules/main/classes/general/component.php:629
#14: CBitrixComponent->includeComponentTemplate(string)
	/home/bitrix/www/bitrix/components/bitrix/catalog/component.php:167
#15: include(string)
	/home/bitrix/www/bitrix/modules/main/classes/general/component.php:548
#16: CBitrixComponent->__includeComponent()
	/home/bitrix/www/bitrix/modules/main/classes/general/component.php:600
#17: CBitrixComponent->includeComponent(string, array, boolean)
	/home/bitrix/www/bitrix/modules/main/classes/general/main.php:1035
#18: CAllMain->IncludeComponent(string, string, array, boolean)
	/home/bitrix/www/catalog/index.php:198
#19: include_once(string)
	/home/bitrix/www/bitrix/modules/main/include/urlrewrite.php:159
#20: include_once(string)
	/home/bitrix/www/bitrix/urlrewrite.php:2