Fatal error: Uncaught Framework\Db\Exception\DatabaseError: Could not process Query execution. PDO execute query failed.

SELECT  `structure`.`ID` AS id, `structure`.`SORT` AS sort, `structure`.`NAME` AS name, `structure`.`SITE_ID` AS siteId, `structure`.`PARENT_ID` AS parentId, `structure`.`URL` AS url, `structure`.`TITLE` AS title, `structure`.`KEYWORDS` AS keywords, `structure`.`DESCRIPTION` AS description, `structure`.`SEO_TEXT` AS seoText, `structure`.`REDIRECT_URL` AS redirectUrl, `structure`.`TEXT` AS text, `structure`.`PUBLISH` AS publish, `structure`.`COUNTER_CODE` AS counterCode, `structure`.`IN_SEARCH` AS inSearch, `structure`.`CONTROLLER_ID` AS controllerId, `structure`.`TEMPLATE_ID` AS templateId, `structure`.`SECTION_ID` AS sectionId, `structure`.`GOOGLE_META_KEY` AS googleMetaKey, `structure`.`YANDEX_META_KEY` AS yandexMetaKey  FROM `articles`.`structure`  WHERE  `structure`.`URL` = :structure_url_1  AND  `structure`.`SITE_ID` = :structure_siteId_2  LIMIT 0,  1

Error info: HY000
2006
MySQL server has gone away

 in /www/mk.ru.d/v1/pub/Framework/Source/Db/Connection.php:342
Stack trace:
#0 /www/mk.ru.d/v1/pub/Framework/Source/Db/Mysql/Query.php(185): Framework\Db\Connection->execute(' SELECT  `struc...', Array)
#1 /www/mk.ru.d/v1/pub/Framework/Source/Orm/Infrastructure/Mysql/MysqlEntityLoader.php(119): Framework\Db\Mysql\Query->execute()
#2 /www/mk.ru.d/v1/pub/Framework/Source/Orm/Infrastructure/Memcache/MemcacheEntityLoader.php(90): Framework\Orm\Infrastructure\Mysql\MysqlEntityLoader->load('structure', Array)
#3 /www/mk.ru.d/v1/pub/Framework/Source/Orm/Infrastructure/InMemory/InMemoryEntityLoader.php(79): Framework\Orm\Infrastructure\Memcache\MemcacheEntityLoader->load('structure', Array)
#4 /www/mk.ru.d/v1/pub/Framework/Source/Orm/Domain/EntityLoader/EntitiesBatchLoaderDecorator.php(61): Framework\Orm\Infrastructure\InMemory\InMemoryEntityLoader->load('structure', Array)
#5 /www/mk.ru.d/v1/pub/Framework/Source/EntityView/EntitiesManager.php(315): Framework\Orm\Domain\EntityLoader\EntitiesBatchLoaderDecorator->load('structure', Array)
#6 /www/mk.ru.d/v1/pub/Source/Mkru/Application/Listener/Http/PageWithEndSlashFinderListener.php(74): Framework\EntityView\EntitiesManager->getObject('structure', Array)
#7 /www/mk.ru.d/v1/pub/composer/vendor/symfony/event-dispatcher/EventDispatcher.php(270): Mkru\Mkru\Application\Listener\Http\PageWithEndSlashFinderListener->findPageWithSlash(Object(Framework\WebApplication\Domain\Event\WebOnExceptionEvent), 'web.exception.M...', Object(Symfony\Component\EventDispatcher\EventDispatcher))
#8 /www/mk.ru.d/v1/pub/composer/vendor/symfony/event-dispatcher/EventDispatcher.php(230): Symfony\Component\EventDispatcher\EventDispatcher::Symfony\Component\EventDispatcher\{closure}(Object(Framework\WebApplication\Domain\Event\WebOnExceptionEvent), 'web.exception.M...', Object(Symfony\Component\EventDispatcher\EventDispatcher))
#9 /www/mk.ru.d/v1/pub/composer/vendor/symfony/event-dispatcher/EventDispatcher.php(59): Symfony\Component\EventDispatcher\EventDispatcher->callListeners(Array, 'web.exception.M...', Object(Framework\WebApplication\Domain\Event\WebOnExceptionEvent))
#10 /www/mk.ru.d/v1/pub/Framework/Source/WebApplication/Domain/WebApplication.php(145): Symfony\Component\EventDispatcher\EventDispatcher->dispatch(Object(Framework\WebApplication\Domain\Event\WebOnExceptionEvent), 'web.exception.M...')
#11 /www/mk.ru.d/v1/pub/Front/Mkru/index.php(9): Framework\WebApplication\Domain\WebApplication->handleRequest(Object(Symfony\Component\HttpFoundation\Request))
#12 {main}
  thrown in /www/mk.ru.d/v1/pub/Framework/Source/Db/Connection.php on line 342