You cannot define a correlation name 'at_order_position' more than once

#0 /home/www/web1/public_html/lib/Varien/Db/Select.php(281): Zend_Db_Select->_join('left join', Array, '(`at_order_posi...', Array, NULL)
#1 /home/www/web1/public_html/app/code/core/Zend/Db/Select.php(373): Varien_Db_Select->_join('left join', Array, '(`at_order_posi...', Array, NULL)
#2 /home/www/web1/public_html/app/code/core/Mage/Eav/Model/Entity/Collection/Abstract.php(1346): Zend_Db_Select->joinLeft(Array, '(`at_order_posi...', Array)
#3 /home/www/web1/public_html/app/code/core/Mage/Catalog/Model/Resource/Collection/Abstract.php(218): Mage_Eav_Model_Entity_Collection_Abstract->_joinAttributeToSelect('joinLeft', Object(Mage_Catalog_Model_Resource_Eav_Attribute), 'at_order_positi...', Array, 'order_position', 'at_order_positi...')
#4 /home/www/web1/public_html/app/code/core/Mage/Eav/Model/Entity/Collection/Abstract.php(1314): Mage_Catalog_Model_Resource_Collection_Abstract->_joinAttributeToSelect('joinLeft', Object(Mage_Catalog_Model_Resource_Eav_Attribute), 'at_order_positi...', Array, 'order_position', 'at_order_positi...')
#5 /home/www/web1/public_html/app/code/core/Mage/Eav/Model/Entity/Collection/Abstract.php(373): Mage_Eav_Model_Entity_Collection_Abstract->_addAttributeJoin('order_position', 'left')
#6 /home/www/web1/public_html/app/code/core/Mage/Catalog/Model/Resource/Product/Collection.php(1600): Mage_Eav_Model_Entity_Collection_Abstract->addAttributeToSort('order_position', 'ASC')
#7 /home/www/web1/public_html/app/code/core/Mage/Eav/Model/Entity/Collection/Abstract.php(1442): Mage_Catalog_Model_Resource_Product_Collection->addAttributeToSort('order_position', 'ASC')
#8 /home/www/web1/public_html/app/code/core/Mage/Eav/Model/Entity/Collection/Abstract.php(868): Mage_Eav_Model_Entity_Collection_Abstract->_renderOrders()
#9 /home/www/web1/public_html/app/code/core/Mage/Review/Model/Observer.php(78): Mage_Eav_Model_Entity_Collection_Abstract->load()
#10 /home/www/web1/public_html/app/code/core/Mage/Core/Model/App.php(1358): Mage_Review_Model_Observer->catalogBlockProductCollectionBeforeToHtml(Object(Varien_Event_Observer))
#11 /home/www/web1/public_html/app/code/core/Mage/Core/Model/App.php(1331): Mage_Core_Model_App->_callObserverMethod(Object(Mage_Review_Model_Observer), 'catalogBlockPro...', Object(Varien_Event_Observer))
#12 /home/www/web1/public_html/app/Mage.php(452): Mage_Core_Model_App->dispatchEvent('catalog_block_p...', Array)
#13 /home/www/web1/public_html/app/code/core/Mage/Catalog/Block/Product/List.php(160): Mage::dispatchEvent('catalog_block_p...', Array)
#14 /home/www/web1/public_html/app/code/core/Mage/Core/Block/Abstract.php(922): Mage_Catalog_Block_Product_List->_beforeToHtml()
#15 /home/www/web1/public_html/app/code/core/Mage/Core/Block/Text/List.php(43): Mage_Core_Block_Abstract->toHtml()
#16 /home/www/web1/public_html/app/code/core/Mage/Core/Block/Abstract.php(923): Mage_Core_Block_Text_List->_toHtml()
#17 /home/www/web1/public_html/app/code/core/Mage/Core/Block/Text/List.php(43): Mage_Core_Block_Abstract->toHtml()
#18 /home/www/web1/public_html/app/code/core/Mage/Core/Block/Abstract.php(923): Mage_Core_Block_Text_List->_toHtml()
#19 /home/www/web1/public_html/app/code/core/Mage/Core/Block/Abstract.php(641): Mage_Core_Block_Abstract->toHtml()
#20 /home/www/web1/public_html/app/code/core/Mage/Core/Block/Abstract.php(585): Mage_Core_Block_Abstract->_getChildHtml('content', true)
#21 /home/www/web1/public_html/.modman/Sns_Kalins/app/design/frontend/default/sns_kalins/template/page/1column.phtml(144): Mage_Core_Block_Abstract->getChildHtml('content')
#22 /home/www/web1/public_html/app/code/local/Mage/Core/Block/Template.php(246): include('/home/www/web1/...')
#23 /home/www/web1/public_html/app/code/local/Mage/Core/Block/Template.php(287): Mage_Core_Block_Template->fetchView('frontend/defaul...')
#24 /home/www/web1/public_html/app/code/local/Mage/Core/Block/Template.php(301): Mage_Core_Block_Template->renderView()
#25 /home/www/web1/public_html/app/code/core/Mage/Core/Block/Abstract.php(923): Mage_Core_Block_Template->_toHtml()
#26 /home/www/web1/public_html/app/code/core/Mage/Core/Model/Layout.php(555): Mage_Core_Block_Abstract->toHtml()
#27 /home/www/web1/public_html/app/code/core/Mage/Core/Controller/Varien/Action.php(390): Mage_Core_Model_Layout->getOutput()
#28 /home/www/web1/public_html/.modman/Amasty_LandingPages/app/code/local/Amasty/Xlanding/controllers/PageController.php(154): Mage_Core_Controller_Varien_Action->renderLayout()
#29 /home/www/web1/public_html/app/code/core/Mage/Core/Controller/Varien/Action.php(418): Amasty_Xlanding_PageController->viewAction()
#30 /home/www/web1/public_html/app/code/local/Mage/Core/Controller/Varien/Router/Standard.php(267): Mage_Core_Controller_Varien_Action->dispatch('view')
#31 /home/www/web1/public_html/app/code/core/Mage/Core/Controller/Varien/Front.php(172): Mage_Core_Controller_Varien_Router_Standard->match(Object(Mage_Core_Controller_Request_Http))
#32 /home/www/web1/public_html/app/code/core/Mage/Core/Model/App.php(365): Mage_Core_Controller_Varien_Front->dispatch()
#33 /home/www/web1/public_html/app/Mage.php(687): Mage_Core_Model_App->run(Array)
#34 /home/www/web1/public_html/index.php(154): Mage::run('base', 'website')
#35 {main}