SQLSTATE[23000]: Integrity constraint violation: 1048 Column 'email' cannot be null

#0 /usr/share/ZendFramework-1.5.2/library/Zend/Db/Statement.php(283): Zend_Db_Statement_Pdo->_execute(Array)
#1 /usr/share/ZendFramework-1.5.2/library/Zend/Db/Adapter/Abstract.php(405): Zend_Db_Statement->execute(Array)
#2 /usr/share/ZendFramework-1.5.2/library/Zend/Db/Adapter/Pdo/Abstract.php(205): Zend_Db_Adapter_Abstract->query('INSERT INTO `fe...', Array)
#3 /usr/share/ZendFramework-1.5.2/library/Zend/Db/Adapter/Abstract.php(483): Zend_Db_Adapter_Pdo_Abstract->query('INSERT INTO `fe...', Array)
#4 /var/www/vhosts/wholetravel.com/application/controllers/FeedbackController.php(31): Zend_Db_Adapter_Abstract->insert('feedback', Array)
#5 /usr/share/ZendFramework-1.5.2/library/Zend/Controller/Action.php(502): FeedbackController->indexAction()
#6 /usr/share/ZendFramework-1.5.2/library/Zend/Controller/Dispatcher/Standard.php(293): Zend_Controller_Action->dispatch('indexAction')
#7 /usr/share/ZendFramework-1.5.2/library/Zend/Controller/Front.php(914): Zend_Controller_Dispatcher_Standard->dispatch(Object(Zend_Controller_Request_Http), Object(Zend_Controller_Response_Http))
#8 /var/www/vhosts/wholetravel.com/httpdocs/index.php(146): Zend_Controller_Front->dispatch()
#9 {main}