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

WHERE `iblock_property`.`IBLOCK_ID` = 21
AND `iblock_property`.`ACTIVE` = 'Y'
ORDER BY `SORT` ASC, `ID` ASC
/home/bitrix/shared-student/bitrix/modules/main/lib/db/mysqliconnection.php:137
#0: Bitrix\Main\DB\MysqliConnection->queryInternal(string, array, NULL)
	/home/bitrix/shared-student/bitrix/modules/main/lib/db/connection.php:330
#1: Bitrix\Main\DB\Connection->query(string)
	/home/bitrix/shared-student/bitrix/modules/main/lib/orm/query/query.php:3193
#2: Bitrix\Main\ORM\Query\Query->query(string)
	/home/bitrix/shared-student/bitrix/modules/main/lib/orm/query/query.php:806
#3: Bitrix\Main\ORM\Query\Query->exec()
	/home/bitrix/shared-student/bitrix/modules/main/lib/orm/data/datamanager.php:457
#4: Bitrix\Main\ORM\Data\DataManager::getList(array)
	/home/bitrix/shared-student/bitrix/modules/iblock/lib/component/base.php:2074
#5: Bitrix\Iblock\Component\Base->getPropertyList(integer, array)
	/home/bitrix/shared-student/bitrix/modules/iblock/lib/component/elementlist.php:821
#6: Bitrix\Iblock\Component\ElementList->modifyDisplayProperties(integer, array)
	/home/bitrix/shared-student/bitrix/modules/iblock/lib/component/base.php:708
#7: Bitrix\Iblock\Component\Base->initElementList()
	/home/bitrix/shared-student/bitrix/components/bitrix/catalog.section/class.php:581
#8: CatalogSectionComponent->initElementList()
	/home/bitrix/shared-student/bitrix/modules/iblock/lib/component/base.php:3661
#9: Bitrix\Iblock\Component\Base->processResultData()
	/home/bitrix/shared-student/bitrix/components/bitrix/catalog.section/class.php:91
#10: CatalogSectionComponent->processResultData()
	/home/bitrix/shared-student/bitrix/modules/iblock/lib/component/base.php:4137
#11: Bitrix\Iblock\Component\Base->loadData()
	/home/bitrix/shared-student/bitrix/modules/iblock/lib/component/elementlist.php:1167
#12: Bitrix\Iblock\Component\ElementList->loadData()
	/home/bitrix/shared-student/bitrix/modules/iblock/lib/component/base.php:4126
#13: Bitrix\Iblock\Component\Base->initialLoadAction()
	/home/bitrix/shared-student/bitrix/components/bitrix/catalog.section/class.php:333
#14: CatalogSectionComponent->initialLoadAction()
	
#15: call_user_func(array)
	/home/bitrix/shared-student/bitrix/modules/iblock/lib/component/base.php:4311
#16: Bitrix\Iblock\Component\Base->doAction()
	/home/bitrix/shared-student/bitrix/modules/iblock/lib/component/base.php:4329
#17: Bitrix\Iblock\Component\Base->executeComponent()
	/home/bitrix/shared-student/bitrix/modules/main/classes/general/component.php:638
#18: CBitrixComponent->includeComponent(string, array, object)
	/home/bitrix/shared-student/bitrix/modules/main/classes/general/main.php:1038
#19: CAllMain->IncludeComponent(string, string, array, object)
	/home/bitrix/shared-student/bitrix/templates/proopt_default_s1/components/bitrix/catalog/gopro/section.php:380
#20: include(string)
	/home/bitrix/shared-student/bitrix/modules/main/classes/general/component_template.php:725
#21: CBitrixComponentTemplate->__IncludePHPTemplate(array, array, string)
	/home/bitrix/shared-student/bitrix/modules/main/classes/general/component_template.php:820
#22: CBitrixComponentTemplate->IncludeTemplate(array)
	/home/bitrix/shared-student/bitrix/modules/main/classes/general/component.php:735
#23: CBitrixComponent->showComponentTemplate()
	/home/bitrix/shared-student/bitrix/modules/main/classes/general/component.php:683
#24: CBitrixComponent->includeComponentTemplate(string)
	/home/bitrix/shared-student/bitrix/components/bitrix/catalog/component.php:171
#25: include(string)
	/home/bitrix/shared-student/bitrix/modules/main/classes/general/component.php:594
#26: CBitrixComponent->__includeComponent()
	/home/bitrix/shared-student/bitrix/modules/main/classes/general/component.php:653
#27: CBitrixComponent->includeComponent(string, array, boolean)
	/home/bitrix/shared-student/bitrix/modules/main/classes/general/main.php:1038
#28: CAllMain->IncludeComponent(string, string, array, boolean)
	/home/bitrix/ext_www/XN--H1AAKGNRYD5B.XN--P1AI/catalog/index.php:902
#29: include_once(string)
	/home/bitrix/shared-student/bitrix/modules/main/include/urlrewrite.php:159
#30: include_once(string)
	/home/bitrix/shared-student/bitrix/urlrewrite.php:2