Magento Commerce

There has been an error processing your request.

Item (Mage_Catalog_Model_Product) with the same id "14" already exist
Trace:
#0 /home/kohlerstor/domains/kohlerstore.nl/public_html/app/code/core/Mage/Eav/Model/Entity/Collection/Abstract.php(188): Varien_Data_Collection->addItem(Object(Mage_Catalog_Model_Product))
#1 /home/kohlerstor/domains/kohlerstore.nl/public_html/app/code/core/Mage/Eav/Model/Entity/Collection/Abstract.php(855): Mage_Eav_Model_Entity_Collection_Abstract->addItem(Object(Mage_Catalog_Model_Product))
#2 /home/kohlerstor/domains/kohlerstore.nl/public_html/app/code/core/Mage/Eav/Model/Entity/Collection/Abstract.php(702): Mage_Eav_Model_Entity_Collection_Abstract->_loadEntities(false, false)
#3 /home/kohlerstor/domains/kohlerstore.nl/public_html/app/code/core/Mage/Catalog/Helper/Product/Compare.php(162): Mage_Eav_Model_Entity_Collection_Abstract->load()
#4 /home/kohlerstor/domains/kohlerstore.nl/public_html/app/code/core/Mage/Reports/Block/Product/Compared.php(57): Mage_Catalog_Helper_Product_Compare->getItemCollection()
#5 /home/kohlerstor/domains/kohlerstore.nl/public_html/app/code/core/Mage/Reports/Block/Product/Abstract.php(71): Mage_Reports_Block_Product_Compared->_getProductsToSkip()
#6 /home/kohlerstor/domains/kohlerstore.nl/public_html/app/code/core/Mage/Reports/Block/Product/Compared.php(77): Mage_Reports_Block_Product_Abstract->_getRecentProductsCollection()
#7 /home/kohlerstor/domains/kohlerstore.nl/public_html/app/code/core/Mage/Core/Block/Abstract.php(643): Mage_Reports_Block_Product_Compared->_toHtml()
#8 /home/kohlerstor/domains/kohlerstore.nl/public_html/app/code/core/Mage/Core/Block/Text/List.php(43): Mage_Core_Block_Abstract->toHtml()
#9 /home/kohlerstor/domains/kohlerstore.nl/public_html/app/code/core/Mage/Core/Block/Abstract.php(643): Mage_Core_Block_Text_List->_toHtml()
#10 /home/kohlerstor/domains/kohlerstore.nl/public_html/app/code/core/Mage/Core/Block/Abstract.php(503): Mage_Core_Block_Abstract->toHtml()
#11 /home/kohlerstor/domains/kohlerstore.nl/public_html/app/code/core/Mage/Core/Block/Abstract.php(454): Mage_Core_Block_Abstract->_getChildHtml('right', true)
#12 /home/kohlerstor/domains/kohlerstore.nl/public_html/app/design/frontend/default/kohlersport/template/page/3columns.phtml(71): Mage_Core_Block_Abstract->getChildHtml('right')
#13 /home/kohlerstor/domains/kohlerstore.nl/public_html/app/code/core/Mage/Core/Block/Template.php(144): include('/home/kohlersto...')
#14 /home/kohlerstor/domains/kohlerstore.nl/public_html/app/code/core/Mage/Core/Block/Template.php(176): Mage_Core_Block_Template->fetchView('frontend/defaul...')
#15 /home/kohlerstor/domains/kohlerstore.nl/public_html/app/code/core/Mage/Core/Block/Template.php(193): Mage_Core_Block_Template->renderView()
#16 /home/kohlerstor/domains/kohlerstore.nl/public_html/app/code/core/Mage/Core/Block/Abstract.php(643): Mage_Core_Block_Template->_toHtml()
#17 /home/kohlerstor/domains/kohlerstore.nl/public_html/app/code/core/Mage/Core/Model/Layout.php(525): Mage_Core_Block_Abstract->toHtml()
#18 /home/kohlerstor/domains/kohlerstore.nl/public_html/app/code/core/Mage/Core/Controller/Varien/Action.php(325): Mage_Core_Model_Layout->getOutput()
#19 /home/kohlerstor/domains/kohlerstore.nl/public_html/app/code/core/Mage/Catalog/controllers/ProductController.php(129): Mage_Core_Controller_Varien_Action->renderLayout()
#20 /home/kohlerstor/domains/kohlerstore.nl/public_html/app/code/core/Mage/Core/Controller/Varien/Action.php(348): Mage_Catalog_ProductController->viewAction()
#21 /home/kohlerstor/domains/kohlerstore.nl/public_html/app/code/core/Mage/Core/Controller/Varien/Router/Standard.php(163): Mage_Core_Controller_Varien_Action->dispatch('view')
#22 /home/kohlerstor/domains/kohlerstore.nl/public_html/app/code/core/Mage/Core/Controller/Varien/Front.php(174): Mage_Core_Controller_Varien_Router_Standard->match(Object(Mage_Core_Controller_Request_Http))
#23 /home/kohlerstor/domains/kohlerstore.nl/public_html/app/Mage.php(450): Mage_Core_Controller_Varien_Front->dispatch()
#24 /home/kohlerstor/domains/kohlerstore.nl/public_html/index.php(52): Mage::run()
#25 {main}