Notice: Undefined index: HTTP_REFERER  in /var/www/public_html/magento/app/code/local/Kvt/Inquiry/controllers/IndexController.php on line 51

#0 /var/www/public_html/magento/app/code/local/Kvt/Inquiry/controllers/IndexController.php(51): mageCoreErrorHandler(8, 'Undefined index...', '/var/www/public...', 51, Array)
#1 /var/www/public_html/magento/app/code/core/Mage/Core/Controller/Varien/Action.php(418): Kvt_Inquiry_IndexController->addAction()
#2 /var/www/public_html/magento/app/code/core/Mage/Core/Controller/Varien/Router/Standard.php(254): Mage_Core_Controller_Varien_Action->dispatch('add')
#3 /var/www/public_html/magento/app/code/core/Mage/Core/Controller/Varien/Front.php(172): Mage_Core_Controller_Varien_Router_Standard->match(Object(Mage_Core_Controller_Request_Http))
#4 /var/www/public_html/magento/app/code/core/Mage/Core/Model/App.php(381): Mage_Core_Controller_Varien_Front->dispatch()
#5 /var/www/public_html/magento/app/Mage.php(707): Mage_Core_Model_App->run(Array)
#6 /var/www/public_html/magento/index.php(83): Mage::run('', 'store')
#7 {main}