[Bitrix\Main\DB\SqlQueryException] 
Mysql query error: (2006) MySQL server has gone away (400)
SELECT 
	`sale_internals_custom_fields`.`FIELD` AS `FIELD`,
	`sale_internals_custom_fields`.`ENTITY_ID` AS `ENTITY_ID`,
	`sale_internals_custom_fields`.`ID` AS `UALIAS_0`
FROM `b_sale_order_entities_custom_fields` `sale_internals_custom_fields` 

WHERE 1=0
AND (UPPER(`sale_internals_custom_fields`.`ENTITY_TYPE`) like upper(''))
AND (UPPER(`sale_internals_custom_fields`.`ENTITY_REGISTRY_TYPE`) like upper(''))
/var/www/www-root/data/www/server-expert.com/bitrix/modules/main/lib/db/mysqliconnection.php:137
#0: Bitrix\Main\DB\MysqliConnection->queryInternal(string, array, NULL)
	/var/www/www-root/data/www/server-expert.com/bitrix/modules/main/lib/db/connection.php:330
#1: Bitrix\Main\DB\Connection->query(string)
	/var/www/www-root/data/www/server-expert.com/bitrix/modules/main/lib/orm/query/query.php:3398
#2: Bitrix\Main\ORM\Query\Query->query(string)
	/var/www/www-root/data/www/server-expert.com/bitrix/modules/main/lib/orm/query/query.php:825
#3: Bitrix\Main\ORM\Query\Query->exec()
	/var/www/www-root/data/www/server-expert.com/bitrix/modules/main/lib/orm/data/datamanager.php:500
#4: Bitrix\Main\ORM\Data\DataManager::getList(array)
	/var/www/www-root/data/www/server-expert.com/bitrix/modules/sale/lib/internals/customfieldscontroller.php:135
#5: Bitrix\Sale\Internals\CustomFieldsController->initializeCollection(object)
	/var/www/www-root/data/www/server-expert.com/bitrix/modules/sale/lib/basketitemcollection.php:90
#6: Bitrix\Sale\BasketItemCollection->loadFromArray(array)
	/var/www/www-root/data/www/server-expert.com/bitrix/modules/sale/lib/basketbase.php:185
#7: Bitrix\Sale\BasketBase->loadFromDb(array)
	/var/www/www-root/data/www/server-expert.com/bitrix/modules/sale/lib/basketbase.php:118
#8: Bitrix\Sale\BasketBase::loadItemsForFUser(integer, string)
	/var/www/www-root/data/www/server-expert.com/bitrix/components/bitrix/sale.basket.basket.line/class.php:299
#9: SaleBasketLineComponent->getProducts()
	/var/www/www-root/data/www/server-expert.com/bitrix/components/bitrix/sale.basket.basket.line/class.php:211
#10: SaleBasketLineComponent->executeComponent()
	/var/www/www-root/data/www/server-expert.com/bitrix/modules/main/classes/general/component.php:656
#11: CBitrixComponent->includeComponent(string, array, boolean, boolean)
	/var/www/www-root/data/www/server-expert.com/bitrix/modules/main/classes/general/main.php:1041
#12: CAllMain->IncludeComponent(string, string, array, boolean)
	/var/www/www-root/data/www/server-expert.com/bitrix/templates/dresscodeV2_copy/footer.php:174
#13: include_once(string)
	/var/www/www-root/data/www/server-expert.com/bitrix/modules/main/include/epilog_before.php:93
#14: require(string)
	/var/www/www-root/data/www/server-expert.com/bitrix/modules/main/include/epilog.php:2
#15: require_once(string)
	/var/www/www-root/data/www/server-expert.com/bitrix/footer.php:4
#16: require(string)
	/var/www/www-root/data/www/server-expert.com/catalog/index.php:215
#17: include_once(string)
	/var/www/www-root/data/www/server-expert.com/bitrix/modules/main/include/urlrewrite.php:159
#18: include_once(string)
	/var/www/www-root/data/www/server-expert.com/bitrix/urlrewrite.php:2

Fatal error: Uncaught Bitrix\Main\DB\SqlQueryException: Mysql query error: (2006) MySQL server has gone away in /var/www/www-root/data/www/server-expert.com/bitrix/modules/main/lib/db/mysqliconnection.php:137 Stack trace: #0 /var/www/www-root/data/www/server-expert.com/bitrix/modules/main/lib/db/connection.php(330): Bitrix\Main\DB\MysqliConnection->queryInternal('SELECT \n\t`main_...', Array, NULL) #1 /var/www/www-root/data/www/server-expert.com/bitrix/modules/main/lib/orm/query/query.php(3398): Bitrix\Main\DB\Connection->query('SELECT \n\t`main_...') #2 /var/www/www-root/data/www/server-expert.com/bitrix/modules/main/lib/orm/query/query.php(825): Bitrix\Main\ORM\Query\Query->query('SELECT \n\t`main_...') #3 /var/www/www-root/data/www/server-expert.com/bitrix/modules/main/lib/orm/data/datamanager.php(500): Bitrix\Main\ORM\Query\Query->exec() #4 /var/www/www-root/data/www/server-expert.com/bitrix/modules/main/lib/analytics/sitespeed.php(95): Bitrix\Main\ORM\Data\DataManager::getList(Array) #5 /var/www/www-root/data/www/ser in /var/www/www-root/data/www/server-expert.com/bitrix/modules/main/lib/db/mysqliconnection.php on line 137