SQLSTATE[HY000]: General error: 2013 Lost connection to MySQL server during query

#0 /data/apache/htdocs/magento/lib/Zend/Db/Adapter/Pdo/Abstract.php(261): PDO->beginTransaction()
#1 /data/apache/htdocs/magento/lib/Zend/Db/Adapter/Abstract.php(473): Zend_Db_Adapter_Pdo_Abstract->_beginTransaction()
#2 /data/apache/htdocs/magento/lib/Varien/Db/Adapter/Pdo/Mysql.php(123): Zend_Db_Adapter_Abstract->beginTransaction()
#3 /data/apache/htdocs/magento/app/code/core/Mage/Core/Model/Resource/Abstract.php(63): Varien_Db_Adapter_Pdo_Mysql->beginTransaction()
#4 /data/apache/htdocs/magento/app/code/core/Mage/Core/Model/Abstract.php(247): Mage_Core_Model_Resource_Abstract->beginTransaction()
#5 /data/apache/htdocs/magento/app/code/core/Mage/Log/Model/Visitor.php(179): Mage_Core_Model_Abstract->save()
#6 /data/apache/htdocs/magento/app/code/core/Mage/Core/Model/App.php(1239): Mage_Log_Model_Visitor->saveByRequest(Object(Varien_Event_Observer))
#7 /data/apache/htdocs/magento/app/Mage.php(303): Mage_Core_Model_App->dispatchEvent('controller_acti...', Array)
#8 /data/apache/htdocs/magento/app/code/core/Mage/Core/Controller/Varien/Action.php(483): Mage::dispatchEvent('controller_acti...', Array)
#9 /data/apache/htdocs/magento/app/code/core/Mage/Core/Controller/Front/Action.php(56): Mage_Core_Controller_Varien_Action->postDispatch()
#10 /data/apache/htdocs/magento/app/code/core/Mage/Core/Controller/Varien/Action.php(380): Mage_Core_Controller_Front_Action->postDispatch()
#11 /data/apache/htdocs/magento/app/code/core/Mage/Core/Controller/Varien/Router/Standard.php(248): Mage_Core_Controller_Varien_Action->dispatch('view')
#12 /data/apache/htdocs/magento/app/code/core/Mage/Core/Controller/Varien/Front.php(158): Mage_Core_Controller_Varien_Router_Standard->match(Object(Mage_Core_Controller_Request_Http))
#13 /data/apache/htdocs/magento/app/Mage.php(459): Mage_Core_Controller_Varien_Front->dispatch()
#14 /data/apache/htdocs/magento/index.php(126): Mage::run()
#15 {main}

Fatal error: Exception thrown without a stack frame in Unknown on line 0