Item (Mage_Catalog_Model_Product) with the same id "542" already exist

#0 /home/nutrivid/public_html/app/code/core/Mage/Eav/Model/Entity/Collection/Abstract.php(265): Varien_Data_Collection->addItem(Object(Mage_Catalog_Model_Product))
#1 /home/nutrivid/public_html/app/code/core/Mage/Eav/Model/Entity/Collection/Abstract.php(1056): Mage_Eav_Model_Entity_Collection_Abstract->addItem(Object(Mage_Catalog_Model_Product))
#2 /home/nutrivid/public_html/app/code/core/Mage/Eav/Model/Entity/Collection/Abstract.php(871): Mage_Eav_Model_Entity_Collection_Abstract->_loadEntities(false, false)
#3 /home/nutrivid/public_html/lib/Varien/Data/Collection.php(752): Mage_Eav_Model_Entity_Collection_Abstract->load()
#4 /home/nutrivid/public_html/app/code/core/Mage/Reports/Block/Product/Abstract.php(189): Varien_Data_Collection->count()
#5 /home/nutrivid/public_html/app/code/core/Mage/Reports/Block/Product/Viewed.php(67): Mage_Reports_Block_Product_Abstract->getCount()
#6 /home/nutrivid/public_html/app/code/core/Mage/Reports/Block/Product/Viewed.php(78): Mage_Reports_Block_Product_Viewed->getCount()
#7 /home/nutrivid/public_html/app/code/core/Mage/Core/Block/Abstract.php(923): Mage_Reports_Block_Product_Viewed->_toHtml()
#8 /home/nutrivid/public_html/app/code/core/Mage/Core/Block/Text/List.php(43): Mage_Core_Block_Abstract->toHtml()
#9 /home/nutrivid/public_html/app/code/core/Mage/Core/Block/Abstract.php(923): Mage_Core_Block_Text_List->_toHtml()
#10 /home/nutrivid/public_html/app/code/core/Mage/Core/Block/Abstract.php(641): Mage_Core_Block_Abstract->toHtml()
#11 /home/nutrivid/public_html/app/code/core/Mage/Core/Block/Abstract.php(585): Mage_Core_Block_Abstract->_getChildHtml('right', true)
#12 /home/nutrivid/public_html/app/design/frontend/rwd/default/template/page/3columns.phtml(64): Mage_Core_Block_Abstract->getChildHtml('right')
#13 /home/nutrivid/public_html/app/code/core/Mage/Core/Block/Template.php(241): include('/home/nutrivid/...')
#14 /home/nutrivid/public_html/app/code/core/Mage/Core/Block/Template.php(272): Mage_Core_Block_Template->fetchView('frontend/rwd/de...')
#15 /home/nutrivid/public_html/app/code/core/Mage/Core/Block/Template.php(286): Mage_Core_Block_Template->renderView()
#16 /home/nutrivid/public_html/app/code/core/Mage/Core/Block/Abstract.php(923): Mage_Core_Block_Template->_toHtml()
#17 /home/nutrivid/public_html/app/code/core/Mage/Core/Model/Layout.php(555): Mage_Core_Block_Abstract->toHtml()
#18 /home/nutrivid/public_html/app/code/core/Mage/Core/Controller/Varien/Action.php(390): Mage_Core_Model_Layout->getOutput()
#19 /home/nutrivid/public_html/app/code/core/Mage/Catalog/controllers/CategoryController.php(161): Mage_Core_Controller_Varien_Action->renderLayout()
#20 /home/nutrivid/public_html/app/code/core/Mage/Core/Controller/Varien/Action.php(418): Mage_Catalog_CategoryController->viewAction()
#21 /home/nutrivid/public_html/app/code/core/Mage/Core/Controller/Varien/Router/Standard.php(254): Mage_Core_Controller_Varien_Action->dispatch('view')
#22 /home/nutrivid/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))
#23 /home/nutrivid/public_html/app/code/core/Mage/Core/Model/App.php(381): Mage_Core_Controller_Varien_Front->dispatch()
#24 /home/nutrivid/public_html/app/Mage.php(687): Mage_Core_Model_App->run(Array)
#25 /home/nutrivid/public_html/index.php(86): Mage::run('', 'store')
#26 {main}