[Bitrix\Main\DB\SqlQueryException] 
Mysql query error: (2006) MySQL server has gone away (400)
SELECT 
	`iblock_property`.`ID` AS `ID`,
	`iblock_property`.`IBLOCK_ID` AS `IBLOCK_ID`,
	`iblock_property`.`CODE` AS `CODE`,
	`iblock_property`.`NAME` AS `NAME`,
	`iblock_property`.`SORT` AS `SORT`,
	`iblock_property`.`LINK_IBLOCK_ID` AS `LINK_IBLOCK_ID`,
	`iblock_property`.`PROPERTY_TYPE` AS `PROPERTY_TYPE`,
	`iblock_property`.`USER_TYPE` AS `USER_TYPE`,
	`iblock_property`.`USER_TYPE_SETTINGS` AS `USER_TYPE_SETTINGS`
FROM `b_iblock_property` `iblock_property` 

WHERE `iblock_property`.`IBLOCK_ID` = 51
AND `iblock_property`.`PROPERTY_TYPE` in ('L', 'E', 'S')
AND `iblock_property`.`ACTIVE` = 'Y'
AND `iblock_property`.`MULTIPLE` = 'N'
ORDER BY `SORT` ASC, `ID` ASC
/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:3304
#2: Bitrix\Main\ORM\Query\Query->query(string)
	/home/bitrix/www/bitrix/modules/main/lib/orm/query/query.php:816
#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/iblock/classes/general/comp_pricetools.php:1887
#5: CIBlockPriceTools::getTreeProperties(array, array, array)
	/home/bitrix/www/bitrix/modules/iblock/lib/component/elementlist.php:2018
#6: Bitrix\Iblock\Component\ElementList->getTemplateSkuPropList()
	/home/bitrix/www/bitrix/modules/iblock/lib/component/elementlist.php:1671
#7: Bitrix\Iblock\Component\ElementList->editTemplateData()
	/home/bitrix/www/bitrix/modules/iblock/lib/component/base.php:4659
#8: Bitrix\Iblock\Component\Base->applyTemplateModifications()
	/home/bitrix/www/bitrix/templates/megamart_default/components/bitrix/catalog.section/catalog/result_modifier.php:193
#9: include(string)
	/home/bitrix/www/bitrix/modules/main/classes/general/component_template.php:882
#10: CBitrixComponentTemplate->__IncludeMutatorFile(array, array)
	/home/bitrix/www/bitrix/modules/main/classes/general/component_template.php:789
#11: CBitrixComponentTemplate->IncludeTemplate(array)
	/home/bitrix/www/bitrix/modules/main/classes/general/component.php:745
#12: CBitrixComponent->showComponentTemplate()
	/home/bitrix/www/bitrix/modules/main/classes/general/component.php:693
#13: CBitrixComponent->includeComponentTemplate()
	/home/bitrix/www/bitrix/modules/iblock/lib/component/base.php:4463
#14: Bitrix\Iblock\Component\Base->loadData()
	/home/bitrix/www/bitrix/modules/iblock/lib/component/elementlist.php:1201
#15: Bitrix\Iblock\Component\ElementList->loadData()
	/home/bitrix/www/bitrix/modules/iblock/lib/component/base.php:4442
#16: Bitrix\Iblock\Component\Base->initialLoadAction()
	/home/bitrix/www/bitrix/components/bitrix/catalog.section/class.php:333
#17: CatalogSectionComponent->initialLoadAction()
	
#18: call_user_func(array)
	/home/bitrix/www/bitrix/modules/iblock/lib/component/base.php:4627
#19: Bitrix\Iblock\Component\Base->doAction()
	/home/bitrix/www/bitrix/modules/iblock/lib/component/base.php:4645
#20: Bitrix\Iblock\Component\Base->executeComponent()
	/home/bitrix/www/bitrix/modules/main/classes/general/component.php:648
#21: CBitrixComponent->includeComponent(string, array, object)
	/home/bitrix/www/bitrix/modules/main/classes/general/main.php:1039
#22: CAllMain->IncludeComponent(string, string, array, object)
	/home/bitrix/www/bitrix/templates/megamart_default/components/bitrix/catalog/catalog/section.php:705
#23: include(string)
	/home/bitrix/www/bitrix/modules/main/classes/general/component_template.php:725
#24: CBitrixComponentTemplate->__IncludePHPTemplate(array, array, string)
	/home/bitrix/www/bitrix/modules/main/classes/general/component_template.php:820
#25: CBitrixComponentTemplate->IncludeTemplate(array)
	/home/bitrix/www/bitrix/modules/main/classes/general/component.php:745
#26: CBitrixComponent->showComponentTemplate()
	/home/bitrix/www/bitrix/modules/main/classes/general/component.php:693
#27: CBitrixComponent->includeComponentTemplate(string)
	/home/bitrix/www/bitrix/components/bitrix/catalog/component.php:171
#28: include(string)
	/home/bitrix/www/bitrix/modules/main/classes/general/component.php:604
#29: CBitrixComponent->__includeComponent()
	/home/bitrix/www/bitrix/modules/main/classes/general/component.php:663
#30: CBitrixComponent->includeComponent(string, array, boolean)
	/home/bitrix/www/bitrix/modules/main/classes/general/main.php:1039
#31: CAllMain->IncludeComponent(string, string, array, boolean)
	/home/bitrix/www/catalog/index.php:1272
#32: include_once(string)
	/home/bitrix/www/bitrix/modules/main/include/urlrewrite.php:159
#33: include_once(string)
	/home/bitrix/www/bitrix/urlrewrite.php:2