Notice: Undefined index: HTTP_REFERER  in /var/www/vhosts/c2bpromo.com/httpdocs/app/code/core/Mage/Directory/controllers/CurrencyController.php on line 49

#0 /var/www/vhosts/c2bpromo.com/httpdocs/app/code/core/Mage/Directory/controllers/CurrencyController.php(49): mageCoreErrorHandler(8, 'Undefined index...', '/var/www/vhosts...', 49, Array)
#1 /var/www/vhosts/c2bpromo.com/httpdocs/app/code/core/Mage/Core/Controller/Varien/Action.php(419): Mage_Directory_CurrencyController->switchAction()
#2 /var/www/vhosts/c2bpromo.com/httpdocs/app/code/core/Mage/Core/Controller/Varien/Router/Standard.php(254): Mage_Core_Controller_Varien_Action->dispatch('switch')
#3 /var/www/vhosts/c2bpromo.com/httpdocs/app/code/core/Mage/Core/Controller/Varien/Front.php(176): Mage_Core_Controller_Varien_Router_Standard->match(Object(Mage_Core_Controller_Request_Http))
#4 /var/www/vhosts/c2bpromo.com/httpdocs/app/code/core/Mage/Core/Model/App.php(354): Mage_Core_Controller_Varien_Front->dispatch()
#5 /var/www/vhosts/c2bpromo.com/httpdocs/app/Mage.php(686): Mage_Core_Model_App->run(Array)
#6 /var/www/vhosts/c2bpromo.com/httpdocs/index.php(118): Mage::run('', 'store')
#7 {main}