[Bitrix\Main\DB\SqlQueryException] 
Mysql query error: (2006) MySQL server has gone away (400)
SELECT VALUE FROM b_iblock_18_index_val WHERE ID = 10385
LIMIT 0, 1

/home/bitrix/ext_www/bookbars.ru/bitrix/modules/main/lib/db/mysqliconnection.php:137
#0: Bitrix\Main\DB\MysqliConnection->queryInternal(string, NULL, NULL)
	/home/bitrix/ext_www/bookbars.ru/bitrix/modules/main/lib/db/connection.php:330
#1: Bitrix\Main\DB\Connection->query(string, NULL, integer, integer)
	/home/bitrix/ext_www/bookbars.ru/bitrix/modules/main/lib/db/connection.php:358
#2: Bitrix\Main\DB\Connection->queryScalar(string)
	/home/bitrix/ext_www/bookbars.ru/bitrix/modules/iblock/lib/propertyindex/dictionary.php:163
#3: Bitrix\Iblock\PropertyIndex\Dictionary->getStringById(string)
	/home/bitrix/ext_www/bookbars.ru/bitrix/modules/iblock/lib/propertyindex/facet.php:129
#4: Bitrix\Iblock\PropertyIndex\Facet->lookupDictionaryValue(string)
	/home/bitrix/ext_www/bookbars.ru/bitrix/components/bitrix/catalog.smart.filter/component.php:139
#5: include(string)
	/home/bitrix/ext_www/bookbars.ru/bitrix/modules/main/classes/general/component.php:594
#6: CBitrixComponent->__includeComponent()
	/home/bitrix/ext_www/bookbars.ru/bitrix/modules/main/classes/general/component.php:102
#7: CBitrixComponent->executeComponent()
	/home/bitrix/ext_www/bookbars.ru/bitrix/components/bitrix/catalog.smart.filter/class.php:131
#8: CBitrixCatalogSmartFilter->executeComponent()
	/home/bitrix/ext_www/bookbars.ru/bitrix/modules/main/classes/general/component.php:638
#9: CBitrixComponent->includeComponent(string, array, object)
	/home/bitrix/ext_www/bookbars.ru/bitrix/modules/main/classes/general/main.php:1037
#10: CAllMain->IncludeComponent(string, string, array, object, array)
	/home/bitrix/ext_www/bookbars.ru/local/templates/wb_bars/components/bitrix/catalog/main_catalog/section_vertical.php:86
#11: include(string)
	/home/bitrix/ext_www/bookbars.ru/local/templates/wb_bars/components/bitrix/catalog/main_catalog/section.php:75
#12: include(string)
	/home/bitrix/ext_www/bookbars.ru/bitrix/modules/main/classes/general/component_template.php:720
#13: CBitrixComponentTemplate->__IncludePHPTemplate(array, array, string)
	/home/bitrix/ext_www/bookbars.ru/bitrix/modules/main/classes/general/component_template.php:815
#14: CBitrixComponentTemplate->IncludeTemplate(array)
	/home/bitrix/ext_www/bookbars.ru/bitrix/modules/main/classes/general/component.php:735
#15: CBitrixComponent->showComponentTemplate()
	/home/bitrix/ext_www/bookbars.ru/bitrix/modules/main/classes/general/component.php:683
#16: CBitrixComponent->includeComponentTemplate(string)
	/home/bitrix/ext_www/bookbars.ru/bitrix/components/bitrix/catalog/component.php:171
#17: include(string)
	/home/bitrix/ext_www/bookbars.ru/bitrix/modules/main/classes/general/component.php:594
#18: CBitrixComponent->__includeComponent()
	/home/bitrix/ext_www/bookbars.ru/bitrix/modules/main/classes/general/component.php:653
#19: CBitrixComponent->includeComponent(string, array, boolean)
	/home/bitrix/ext_www/bookbars.ru/bitrix/modules/main/classes/general/main.php:1037
#20: CAllMain->IncludeComponent(string, string, array, boolean)
	/home/bitrix/ext_www/bookbars.ru/catalog/index.php:326
#21: include_once(string)
	/home/bitrix/ext_www/bookbars.ru/bitrix/modules/main/include/urlrewrite.php:159
#22: include_once(string)
	/home/bitrix/ext_www/bookbars.ru/bitrix/urlrewrite.php:2