[Bitrix\Main\DB\SqlQueryException] 
Mysql query error: (2006) MySQL server has gone away (400)

				SELECT TAG
				FROM b_cache_tag
				WHERE SITE_ID = 'e1'
				AND CACHE_SALT = '/0e4'
				AND RELATIVE_PATH = '/e1/bitrix/catalog.smart.filter/0e4'
			
/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/data/taggedcache.php:55
#2: Bitrix\Main\Data\TaggedCache->initDbCache(string)
	/home/bitrix/www/bitrix/modules/main/lib/data/taggedcache.php:107
#3: Bitrix\Main\Data\TaggedCache->endTagCache()
	/home/bitrix/www/bitrix/modules/main/classes/general/cache.php:463
#4: CCacheManager->EndTagCache()
	/home/bitrix/www/bitrix/modules/main/classes/general/component.php:1173
#5: CBitrixComponent->endResultCache()
	/home/bitrix/www/bitrix/components/bitrix/catalog.smart.filter/component.php:313
#6: include(string)
	/home/bitrix/www/bitrix/modules/main/classes/general/component.php:605
#7: CBitrixComponent->__includeComponent()
	/home/bitrix/www/bitrix/modules/main/classes/general/component.php:103
#8: CBitrixComponent->executeComponent()
	/home/bitrix/www/bitrix/components/bitrix/catalog.smart.filter/class.php:138
#9: CBitrixCatalogSmartFilter->executeComponent()
	/home/bitrix/www/bitrix/modules/main/classes/general/component.php:649
#10: CBitrixComponent->includeComponent(string, array, object)
	/home/bitrix/www/bitrix/modules/main/classes/general/main.php:1039
#11: CAllMain->IncludeComponent(string, string, array, object, array)
	/home/bitrix/www/local/templates/expert24_default/components/tesslab/catalog/main/section_vertical.php:82
#12: include(string)
	/home/bitrix/www/local/templates/expert24_default/components/tesslab/catalog/main/section.php:78
#13: include(string)
	/home/bitrix/www/bitrix/modules/main/classes/general/component_template.php:789
#14: CBitrixComponentTemplate->__IncludePHPTemplate(array, array, string)
	/home/bitrix/www/bitrix/modules/main/classes/general/component_template.php:884
#15: CBitrixComponentTemplate->IncludeTemplate(array)
	/home/bitrix/www/bitrix/modules/main/classes/general/component.php:746
#16: CBitrixComponent->showComponentTemplate()
	/home/bitrix/www/bitrix/modules/main/classes/general/component.php:694
#17: CBitrixComponent->includeComponentTemplate(string)
	/home/bitrix/www/local/components/tesslab/catalog/component.php:197
#18: include(string)
	/home/bitrix/www/bitrix/modules/main/classes/general/component.php:605
#19: CBitrixComponent->__includeComponent()
	/home/bitrix/www/bitrix/modules/main/classes/general/component.php:664
#20: CBitrixComponent->includeComponent(string, array, boolean)
	/home/bitrix/www/bitrix/modules/main/classes/general/main.php:1039
#21: CAllMain->IncludeComponent(string, string, array, boolean)
	/home/bitrix/www/ua/catalog/index.php:530
#22: include_once(string)
	/home/bitrix/www/bitrix/modules/main/include/urlrewrite.php:159
#23: include_once(string)
	/home/bitrix/www/bitrix/urlrewrite.php:2