SQLSTATE[HY000]: General error: 2006 MySQL server has gone away

#0 /var/sites/velooxygen2/publish/velooxygen2-201810-0819-rev8739/www/lib/Varien/Db/Statement/Pdo/Mysql.php(110): Zend_Db_Statement_Pdo->_execute(Array)
#1 /var/sites/velooxygen2/publish/velooxygen2-201810-0819-rev8739/www/lib/Zend/Db/Statement.php(300): Varien_Db_Statement_Pdo_Mysql->_execute(Array)
#2 /var/sites/velooxygen2/publish/velooxygen2-201810-0819-rev8739/www/lib/Zend/Db/Adapter/Abstract.php(479): Zend_Db_Statement->execute(Array)
#3 /var/sites/velooxygen2/publish/velooxygen2-201810-0819-rev8739/www/lib/Zend/Db/Adapter/Pdo/Abstract.php(238): Zend_Db_Adapter_Abstract->query('SELECT `main_ta...', Array)
#4 /var/sites/velooxygen2/publish/velooxygen2-201810-0819-rev8739/www/lib/Varien/Db/Adapter/Pdo/Mysql.php(419): Zend_Db_Adapter_Pdo_Abstract->query('SELECT `main_ta...', Array)
#5 /var/sites/velooxygen2/publish/velooxygen2-201810-0819-rev8739/www/lib/Zend/Db/Adapter/Abstract.php(734): Varien_Db_Adapter_Pdo_Mysql->query('SELECT `main_ta...', Array)
#6 /var/sites/velooxygen2/publish/velooxygen2-201810-0819-rev8739/www/lib/Varien/Data/Collection/Db.php(734): Zend_Db_Adapter_Abstract->fetchAll('SELECT `main_ta...', Array)
#7 /var/sites/velooxygen2/publish/velooxygen2-201810-0819-rev8739/www/app/code/core/Mage/Core/Model/Resource/Db/Collection/Abstract.php(521): Varien_Data_Collection_Db->_fetchAll('SELECT `main_ta...', Array)
#8 /var/sites/velooxygen2/publish/velooxygen2-201810-0819-rev8739/www/lib/Varien/Data/Collection/Db.php(566): Mage_Core_Model_Resource_Db_Collection_Abstract->getData()
#9 /var/sites/velooxygen2/publish/velooxygen2-201810-0819-rev8739/www/lib/Varien/Data/Collection.php(741): Varien_Data_Collection_Db->load()
#10 /var/sites/velooxygen2/publish/velooxygen2-201810-0819-rev8739/www/app/code/local/NBSSystem/Nitrogento/Model/Cache/Fullpage/Config.php(14): Varien_Data_Collection->getIterator()
#11 /var/sites/velooxygen2/publish/velooxygen2-201810-0819-rev8739/www/app/code/local/NBSSystem/Nitrogento/Model/Cache/Fullpage/Observer.php(24): NBSSystem_Nitrogento_Model_Cache_Fullpage_Config->tryPageMatchWithCacheFullpageConfig()
#12 /var/sites/velooxygen2/publish/velooxygen2-201810-0819-rev8739/www/app/code/core/Mage/Core/Model/App.php(1338): NBSSystem_Nitrogento_Model_Cache_Fullpage_Observer->handleFullpageCache(Object(Varien_Event_Observer))
#13 /var/sites/velooxygen2/publish/velooxygen2-201810-0819-rev8739/www/app/code/core/Mage/Core/Model/App.php(1317): Mage_Core_Model_App->_callObserverMethod(Object(NBSSystem_Nitrogento_Model_Cache_Fullpage_Observer), 'handleFullpageC...', Object(Varien_Event_Observer))
#14 /var/sites/velooxygen2/publish/velooxygen2-201810-0819-rev8739/www/app/Mage.php(447): Mage_Core_Model_App->dispatchEvent('controller_acti...', Array)
#15 /var/sites/velooxygen2/publish/velooxygen2-201810-0819-rev8739/www/app/code/core/Mage/Core/Controller/Varien/Action.php(552): Mage::dispatchEvent('controller_acti...', Array)
#16 /var/sites/velooxygen2/publish/velooxygen2-201810-0819-rev8739/www/app/code/core/Mage/Core/Controller/Front/Action.php(75): Mage_Core_Controller_Varien_Action->postDispatch()
#17 /var/sites/velooxygen2/publish/velooxygen2-201810-0819-rev8739/www/app/code/core/Mage/Core/Controller/Varien/Action.php(423): Mage_Core_Controller_Front_Action->postDispatch()
#18 /var/sites/velooxygen2/publish/velooxygen2-201810-0819-rev8739/www/app/code/core/Mage/Core/Controller/Varien/Router/Standard.php(254): Mage_Core_Controller_Varien_Action->dispatch('view')
#19 /var/sites/velooxygen2/publish/velooxygen2-201810-0819-rev8739/www/app/code/core/Mage/Core/Controller/Varien/Front.php(176): Mage_Core_Controller_Varien_Router_Standard->match(Object(Mage_Core_Controller_Request_Http))
#20 /var/sites/velooxygen2/publish/velooxygen2-201810-0819-rev8739/www/app/code/core/Mage/Core/Model/App.php(354): Mage_Core_Controller_Varien_Front->dispatch()
#21 /var/sites/velooxygen2/publish/velooxygen2-201810-0819-rev8739/www/app/Mage.php(683): Mage_Core_Model_App->run(Array)
#22 /var/sites/velooxygen2/publish/velooxygen2-201810-0819-rev8739/www/index_base.php(69): Mage::run('', 'store')
#23 /var/sites/velooxygen2/publish/velooxygen2-201810-0819-rev8739/www/index.php(2): include('/var/sites/velo...')
#24 {main}