[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` = 4
/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/orm/query/query.php:3306
#2: Bitrix\Main\ORM\Query\Query->query(string)
	/home/bitrix/www/bitrix/modules/main/lib/orm/query/query.php:817
#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(array)
	/home/bitrix/www/bitrix/modules/catalog/general/catalog_sku.php:143
#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:657
#8: CAllIBlockElement->MkFilter(array, array, array)
	/home/bitrix/www/bitrix/modules/iblock/classes/general/iblockelement.php:3088
#9: CAllIBlockElement->PrepareGetList(array, array, array, string, array, array, NULL, NULL, array, boolean, string, array, array, array)
	/home/bitrix/www/bitrix/modules/iblock/classes/mysql/iblockelement.php:343
#10: CIBlockElement->prepareSql(array, array, boolean, array)
	/home/bitrix/www/bitrix/modules/iblock/classes/mysql/iblockelement.php:662
#11: CIBlockElement::GetList(array, array, boolean, array, array)
	/home/bitrix/www/bitrix/modules/iblock/lib/component/base.php:1715
#12: Bitrix\Iblock\Component\Base->getSeparateList(array)
	/home/bitrix/www/bitrix/modules/iblock/lib/component/base.php:1680
#13: Bitrix\Iblock\Component\Base->getElementList(integer, NULL)
	/home/bitrix/www/bitrix/modules/iblock/lib/component/elementlist.php:1014
#14: Bitrix\Iblock\Component\ElementList->getElementList(integer, NULL)
	/home/bitrix/www/bitrix/components/bitrix/catalog.section/class.php:539
#15: CatalogSectionComponent->getElementList(integer, NULL)
	/home/bitrix/www/bitrix/modules/iblock/lib/component/base.php:793
#16: Bitrix\Iblock\Component\Base->initElementList()
	/home/bitrix/www/bitrix/components/bitrix/catalog.section/class.php:582
#17: CatalogSectionComponent->initElementList()
	/home/bitrix/www/bitrix/modules/iblock/lib/component/base.php:4048
#18: Bitrix\Iblock\Component\Base->processResultData()
	/home/bitrix/www/bitrix/components/bitrix/catalog.section/class.php:92
#19: CatalogSectionComponent->processResultData()
	/home/bitrix/www/bitrix/modules/iblock/lib/component/base.php:4551
#20: Bitrix\Iblock\Component\Base->loadData()
	/home/bitrix/www/bitrix/modules/iblock/lib/component/elementlist.php:1232
#21: Bitrix\Iblock\Component\ElementList->loadData()
	/home/bitrix/www/bitrix/modules/iblock/lib/component/base.php:4540
#22: Bitrix\Iblock\Component\Base->initialLoadAction()
	/home/bitrix/www/bitrix/components/bitrix/catalog.section/class.php:334
#23: CatalogSectionComponent->initialLoadAction()
	
#24: call_user_func(array)
	/home/bitrix/www/bitrix/modules/iblock/lib/component/base.php:4725
#25: Bitrix\Iblock\Component\Base->doAction()
	/home/bitrix/www/bitrix/modules/iblock/lib/component/base.php:4743
#26: Bitrix\Iblock\Component\Base->executeComponent()
	/home/bitrix/www/bitrix/modules/main/classes/general/component.php:649
#27: CBitrixComponent->includeComponent(string, array, object)
	/home/bitrix/www/bitrix/modules/main/classes/general/main.php:1039
#28: CAllMain->IncludeComponent(string, string, array, object)
	/home/bitrix/www/local/templates/expert24_default/components/tesslab/catalog/main/section_vertical.php:255
#29: include(string)
	/home/bitrix/www/local/templates/expert24_default/components/tesslab/catalog/main/section.php:78
#30: include(string)
	/home/bitrix/www/bitrix/modules/main/classes/general/component_template.php:789
#31: CBitrixComponentTemplate->__IncludePHPTemplate(array, array, string)
	/home/bitrix/www/bitrix/modules/main/classes/general/component_template.php:884
#32: CBitrixComponentTemplate->IncludeTemplate(array)
	/home/bitrix/www/bitrix/modules/main/classes/general/component.php:746
#33: CBitrixComponent->showComponentTemplate()
	/home/bitrix/www/bitrix/modules/main/classes/general/component.php:694
#34: CBitrixComponent->includeComponentTemplate(string)
	/home/bitrix/www/local/components/tesslab/catalog/component.php:197
#35: include(string)
	/home/bitrix/www/bitrix/modules/main/classes/general/component.php:605
#36: CBitrixComponent->__includeComponent()
	/home/bitrix/www/bitrix/modules/main/classes/general/component.php:664
#37: CBitrixComponent->includeComponent(string, array, boolean)
	/home/bitrix/www/bitrix/modules/main/classes/general/main.php:1039
#38: CAllMain->IncludeComponent(string, string, array, boolean)
	/home/bitrix/www/ua/catalog/index.php:530
#39: include_once(string)
	/home/bitrix/www/bitrix/modules/main/include/urlrewrite.php:159
#40: include_once(string)
	/home/bitrix/www/bitrix/urlrewrite.php:2