Zend certified PHP/Magento developer

Magento 1.9 G.T filter problem

I have a G.T(grant total) filter problem with my Magento 1.9 store. When i select the “From” and “To” grant total and i press search i’m redirected to the dashboard index page. Then if i click on “Orders” again i’m greeted by an exception code. When i open that exception this is how it looks:

a:5:{i:0;s:330:"SQLSTATE[23000]: Integrity constraint violation: 1052 Column 'base_grand_total' in where clause is ambiguous, query was: SELECT COUNT(*) FROM `sales_flat_order_grid` AS `main_table`
 INNER JOIN `sales_flat_order` AS `customer` ON customer.entity_id = main_table.entity_id WHERE (`base_grand_total` >= '300' AND `base_grand_total` ";i:1;s:5160:"#0 /var/www/html/lib/Varien/Db/Statement/Pdo/Mysql.php(110): Zend_Db_State$
#1 /var/www/html/app/code/core/Zend/Db/Statement.php(291): Varien_Db_Statement_Pdo_Mysql->_execute(Array)
#2 /var/www/html/lib/Zend/Db/Adapter/Abstract.php(480): Zend_Db_Statement->execute(Array)
#3 /var/www/html/lib/Zend/Db/Adapter/Pdo/Abstract.php(238): Zend_Db_Adapter_Abstract->query('SELECT COUNT(*)...', Array)
#4 /var/www/html/lib/Varien/Db/Adapter/Pdo/Mysql.php(504): Zend_Db_Adapter_Pdo_Abstract->query('SELECT COUNT(*)...', Array)
#5 /var/www/html/lib/Zend/Db/Adapter/Abstract.php(828): Varien_Db_Adapter_Pdo_Mysql->query(Object(Varien_Db_Select), Array)
#6 /var/www/html/lib/Varien/Data/Collection/Db.php(225): Zend_Db_Adapter_Abstract->fetchOne(Object(Varien_Db_Select), Array)
#7 /var/www/html/lib/Varien/Data/Collection.php(225): Varien_Data_Collection_Db->getSize()
#8 /var/www/html/lib/Varien/Data/Collection.php(211): Varien_Data_Collection->getLastPageNumber()
#9 /var/www/html/lib/Varien/Data/Collection/Db.php(522): Varien_Data_Collection->getCurPage()
#10 /var/www/html/lib/Varien/Data/Collection/Db.php(569): Varien_Data_Collection_Db->_renderLimit()
#11 /var/www/html/app/code/local/Mage/Adminhtml/Block/Widget/Grid.php(533): Varien_Data_Collection_Db->load()
#12 /var/www/html/app/code/community/Raveinfosys/Deleteorder/Block/Adminhtml/Sales/Order/Grid.php(28): Mage_Adminhtml_Block_Widget_Grid->_prepareCollection()
#13 /var/www/html/app/code/local/Mage/Adminhtml/Block/Widget/Grid.php(626): Raveinfosys_Deleteorder_Block_Adminhtml_Sales_Order_Grid->_prepareCollection()
#14 /var/www/html/app/code/local/Mage/Adminhtml/Block/Widget/Grid.php(632): Mage_Adminhtml_Block_Widget_Grid->_prepareGrid()
#15 /var/www/html/app/code/core/Mage/Core/Block/Abstract.php(922): Mage_Adminhtml_Block_Widget_Grid->_beforeToHtml()
#16 /var/www/html/app/code/core/Mage/Core/Block/Abstract.php(641): Mage_Core_Block_Abstract->toHtml()
#17 /var/www/html/app/code/core/Mage/Core/Block/Abstract.php(585): Mage_Core_Block_Abstract->_getChildHtml('grid', true)
#18 /var/www/html/app/code/core/Mage/Adminhtml/Block/Widget/Grid/Container.php(77): Mage_Core_Block_Abstract->getChildHtml('grid')
#19 /var/www/html/app/design/adminhtml/default/default/template/widget/grid/container.phtml(36): Mage_Adminhtml_Block_Widget_Grid_Container->getGridHtml()
#20 /var/www/html/app/code/core/Mage/Core/Block/Template.php(241): include('/var/www/html/a...')
#21 /var/www/html/app/code/core/Mage/Core/Block/Template.php(272): Mage_Core_Block_Template->fetchView('adminhtml/defau...')
#22 /var/www/html/app/code/core/Mage/Core/Block/Template.php(286): Mage_Core_Block_Template->renderView()
#23 /var/www/html/app/code/core/Mage/Adminhtml/Block/Template.php(81): Mage_Core_Block_Template->_toHtml()
#24 /var/www/html/app/code/core/Mage/Adminhtml/Block/Widget/Container.php(308): Mage_Adminhtml_Block_Template->_toHtml()
#25 /var/www/html/app/code/core/Mage/Core/Block/Abstract.php(923): Mage_Adminhtml_Block_Widget_Container->_toHtml()
#26 /var/www/html/app/code/core/Mage/Core/Block/Text/List.php(43): Mage_Core_Block_Abstract->toHtml()
#27 /var/www/html/app/code/core/Mage/Core/Block/Abstract.php(923): Mage_Core_Block_Text_List->_toHtml()
#28 /var/www/html/app/code/core/Mage/Core/Block/Abstract.php(641): Mage_Core_Block_Abstract->toHtml()
#29 /var/www/html/app/code/core/Mage/Core/Block/Abstract.php(585): Mage_Core_Block_Abstract->_getChildHtml('content', true)
#30 /var/www/html/app/design/adminhtml/default/default/template/page.phtml(74): Mage_Core_Block_Abstract->getChildHtml('content')
#31 /var/www/html/app/code/core/Mage/Core/Block/Template.php(241): include('/var/www/html/a...')
#32 /var/www/html/app/code/core/Mage/Core/Block/Template.php(272): Mage_Core_Block_Template->fetchView('adminhtml/defau...')
#33 /var/www/html/app/code/core/Mage/Core/Block/Template.php(286): Mage_Core_Block_Template->renderView()
#34 /var/www/html/app/code/core/Mage/Adminhtml/Block/Template.php(81): Mage_Core_Block_Template->_toHtml()
#35 /var/www/html/app/code/core/Mage/Core/Block/Abstract.php(923): Mage_Adminhtml_Block_Template->_toHtml()
#36 /var/www/html/app/code/core/Mage/Core/Model/Layout.php(555): Mage_Core_Block_Abstract->toHtml()
#37 /var/www/html/app/code/core/Mage/Core/Controller/Varien/Action.php(390): Mage_Core_Model_Layout->getOutput()
#38 /var/www/html/app/code/core/Mage/Adminhtml/controllers/Sales/OrderController.php(95): Mage_Core_Controller_Varien_Action->renderLayout()
#39 /var/www/html/app/code/core/Mage/Core/Controller/Varien/Action.php(418): Mage_Adminhtml_Sales_OrderController->indexAction()
#40 /var/www/html/app/code/core/Mage/Core/Controller/Varien/Router/Standard.php(254): Mage_Core_Controller_Varien_Action->dispatch('index')
#41 /var/www/html/app/code/core/Mage/Core/Controller/Varien/Front.php(172): Mage_Core_Controller_Varien_Router_Standard->match(Object(Mage_Core_Controller_Request_Http))
#42 /var/www/html/app/code/core/Mage/Core/Model/App.php(365): Mage_Core_Controller_Varien_Front->dispatch()
#43 /var/www/html/app/Mage.php(684): Mage_Core_Model_App->run(Array)
#44 /var/www/html/index.php(84): Mage::run('', 'store')
#45 {main}";s:3:"url";s:77:"/index.php/adminarea/sales_order/index/key/e201e147530bdfd3cbe72hzd6ba894je/";s:11:"script_name";s:10:"/index.php";s:4:"skin";s:5:"admin";} 

Anybody has any idea about how i could fix this?

Thank you!