Item (Mage_Catalog_Model_Product) with the same id "1812" already exist

#0 /home/on10th/public_html/app/code/core/Mage/Eav/Model/Entity/Collection/Abstract.php(188): Varien_Data_Collection->addItem(Object(Mage_Catalog_Model_Product))
#1 /home/on10th/public_html/app/code/core/Mage/Eav/Model/Entity/Collection/Abstract.php(854): Mage_Eav_Model_Entity_Collection_Abstract->addItem(Object(Mage_Catalog_Model_Product))
#2 /home/on10th/public_html/app/code/core/Mage/Eav/Model/Entity/Collection/Abstract.php(702): Mage_Eav_Model_Entity_Collection_Abstract->_loadEntities(false, false)
#3 /home/on10th/public_html/app/code/core/Mage/Catalog/Block/Product/List/Related.php(54): Mage_Eav_Model_Entity_Collection_Abstract->load()
#4 /home/on10th/public_html/app/code/core/Mage/Catalog/Block/Product/List/Related.php(65): Mage_Catalog_Block_Product_List_Related->_prepareData()
#5 /home/on10th/public_html/app/code/core/Mage/Core/Block/Abstract.php(642): Mage_Catalog_Block_Product_List_Related->_beforeToHtml()
#6 /home/on10th/public_html/app/code/core/Mage/Core/Block/Text/List.php(43): Mage_Core_Block_Abstract->toHtml()
#7 /home/on10th/public_html/app/code/core/Mage/Core/Block/Abstract.php(643): Mage_Core_Block_Text_List->_toHtml()
#8 /home/on10th/public_html/app/code/core/Mage/Core/Block/Abstract.php(503): Mage_Core_Block_Abstract->toHtml()
#9 /home/on10th/public_html/app/code/core/Mage/Core/Block/Abstract.php(454): Mage_Core_Block_Abstract->_getChildHtml('content', true)
#10 /home/on10th/public_html/app/design/frontend/default/modern/template/page/2columns-left.phtml(62): Mage_Core_Block_Abstract->getChildHtml('content')
#11 /home/on10th/public_html/app/code/core/Mage/Core/Block/Template.php(144): include('/home/on10th/pu...')
#12 /home/on10th/public_html/app/code/core/Mage/Core/Block/Template.php(176): Mage_Core_Block_Template->fetchView('frontend/defaul...')
#13 /home/on10th/public_html/app/code/core/Mage/Core/Block/Template.php(193): Mage_Core_Block_Template->renderView()
#14 /home/on10th/public_html/app/code/core/Mage/Core/Block/Abstract.php(643): Mage_Core_Block_Template->_toHtml()
#15 /home/on10th/public_html/app/code/core/Mage/Core/Model/Layout.php(515): Mage_Core_Block_Abstract->toHtml()
#16 /home/on10th/public_html/app/code/core/Mage/Core/Controller/Varien/Action.php(326): Mage_Core_Model_Layout->getOutput()
#17 /home/on10th/public_html/app/code/core/Mage/Catalog/controllers/ProductController.php(129): Mage_Core_Controller_Varien_Action->renderLayout()
#18 /home/on10th/public_html/app/code/core/Mage/Core/Controller/Varien/Action.php(349): Mage_Catalog_ProductController->viewAction()
#19 /home/on10th/public_html/app/code/core/Mage/Core/Controller/Varien/Router/Standard.php(163): Mage_Core_Controller_Varien_Action->dispatch('view')
#20 /home/on10th/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))
#21 /home/on10th/public_html/app/Mage.php(447): Mage_Core_Controller_Varien_Front->dispatch()
#22 /home/on10th/public_html/index.php(46): Mage::run()
#23 {main}