Item (Mage_Catalog_Model_Product) with the same id "9874" already exist

#0 /home/fonari/5.fonari.z8.ru/docs/includes/src/Mage_Eav_Model_Entity_Collection_Abstract.php(236): Varien_Data_Collection->addItem(Object(Mage_Catalog_Model_Product))
#1 /home/fonari/5.fonari.z8.ru/docs/includes/src/Mage_Eav_Model_Entity_Collection_Abstract.php(963): Mage_Eav_Model_Entity_Collection_Abstract->addItem(Object(Mage_Catalog_Model_Product))
#2 /home/fonari/5.fonari.z8.ru/docs/includes/src/Mage_Eav_Model_Entity_Collection_Abstract.php(793): Mage_Eav_Model_Entity_Collection_Abstract->_loadEntities(false, false)
#3 /home/fonari/5.fonari.z8.ru/docs/includes/src/__default.php(4519): Mage_Eav_Model_Entity_Collection_Abstract->load()
#4 /home/fonari/5.fonari.z8.ru/docs/app/design/frontend/base/default/template/catalog/product/compare/sidebar.phtml(39): Mage_Catalog_Helper_Product_Compare->getItemCollection()
#5 /home/fonari/5.fonari.z8.ru/docs/includes/src/__default.php(2922): include('/home/fonari/5....')
#6 /home/fonari/5.fonari.z8.ru/docs/includes/src/__default.php(2949): Mage_Core_Block_Template->fetchView('frontend/base/d...')
#7 /home/fonari/5.fonari.z8.ru/docs/includes/src/__default.php(2963): Mage_Core_Block_Template->renderView()
#8 /home/fonari/5.fonari.z8.ru/docs/includes/src/__default.php(2280): Mage_Core_Block_Template->_toHtml()
#9 /home/fonari/5.fonari.z8.ru/docs/includes/src/__default.php(11386): Mage_Core_Block_Abstract->toHtml()
#10 /home/fonari/5.fonari.z8.ru/docs/includes/src/__default.php(2280): Mage_Core_Block_Text_List->_toHtml()
#11 /home/fonari/5.fonari.z8.ru/docs/includes/src/__default.php(2047): Mage_Core_Block_Abstract->toHtml()
#12 /home/fonari/5.fonari.z8.ru/docs/includes/src/__default.php(1998): Mage_Core_Block_Abstract->_getChildHtml('right', true)
#13 /home/fonari/5.fonari.z8.ru/docs/app/design/frontend/base/default/template/page/3columns.phtml(53): Mage_Core_Block_Abstract->getChildHtml('right')
#14 /home/fonari/5.fonari.z8.ru/docs/includes/src/__default.php(2922): include('/home/fonari/5....')
#15 /home/fonari/5.fonari.z8.ru/docs/includes/src/__default.php(2949): Mage_Core_Block_Template->fetchView('frontend/base/d...')
#16 /home/fonari/5.fonari.z8.ru/docs/includes/src/__default.php(2963): Mage_Core_Block_Template->renderView()
#17 /home/fonari/5.fonari.z8.ru/docs/includes/src/__default.php(2280): Mage_Core_Block_Template->_toHtml()
#18 /home/fonari/5.fonari.z8.ru/docs/includes/src/__default.php(24469): Mage_Core_Block_Abstract->toHtml()
#19 /home/fonari/5.fonari.z8.ru/docs/includes/src/__default.php(11778): Mage_Core_Model_Layout->getOutput()
#20 /home/fonari/5.fonari.z8.ru/docs/app/code/core/Mage/CatalogSearch/controllers/ResultController.php(80): Mage_Core_Controller_Varien_Action->renderLayout()
#21 /home/fonari/5.fonari.z8.ru/docs/includes/src/__default.php(11807): Mage_CatalogSearch_ResultController->indexAction()
#22 /home/fonari/5.fonari.z8.ru/docs/includes/src/__default.php(15760): Mage_Core_Controller_Varien_Action->dispatch('index')
#23 /home/fonari/5.fonari.z8.ru/docs/includes/src/__default.php(15360): Mage_Core_Controller_Varien_Router_Standard->match(Object(Mage_Core_Controller_Request_Http))
#24 /home/fonari/5.fonari.z8.ru/docs/includes/src/__default.php(17561): Mage_Core_Controller_Varien_Front->dispatch()
#25 /home/fonari/5.fonari.z8.ru/docs/app/Mage.php(606): Mage_Core_Model_App->run(Array)
#26 /home/fonari/5.fonari.z8.ru/docs/index.php(81): Mage::run('', 'store')
#27 {main}