Item (Gtechnology_Catalog_Model_Product) with the same id "1878" already exist

#0 /home/develop/prod/www/app/code/core/Mage/Eav/Model/Entity/Collection/Abstract.php(265): Varien_Data_Collection->addItem(Object(Gtechnology_Catalog_Model_Product))
#1 /home/develop/prod/www/app/code/core/Mage/Eav/Model/Entity/Collection/Abstract.php(1056): Mage_Eav_Model_Entity_Collection_Abstract->addItem(Object(Gtechnology_Catalog_Model_Product))
#2 /home/develop/prod/www/app/code/core/Mage/Eav/Model/Entity/Collection/Abstract.php(871): Mage_Eav_Model_Entity_Collection_Abstract->_loadEntities(false, false)
#3 /home/develop/prod/www/app/code/core/Mage/Review/Model/Observer.php(78): Mage_Eav_Model_Entity_Collection_Abstract->load()
#4 /home/develop/prod/www/app/code/core/Mage/Core/Model/App.php(1358): Mage_Review_Model_Observer->catalogBlockProductCollectionBeforeToHtml(Object(Varien_Event_Observer))
#5 /home/develop/prod/www/app/code/core/Mage/Core/Model/App.php(1331): Mage_Core_Model_App->_callObserverMethod(Object(Mage_Review_Model_Observer), 'catalogBlockPro...', Object(Varien_Event_Observer))
#6 /home/develop/prod/www/app/Mage.php(448): Mage_Core_Model_App->dispatchEvent('catalog_block_p...', Array)
#7 /home/develop/prod/www/app/code/core/Mage/Catalog/Block/Product/List.php(161): Mage::dispatchEvent('catalog_block_p...', Array)
#8 /home/develop/prod/www/app/code/core/Mage/Core/Block/Abstract.php(922): Mage_Catalog_Block_Product_List->_beforeToHtml()
#9 /home/develop/prod/www/app/code/core/Mage/Core/Block/Abstract.php(641): Mage_Core_Block_Abstract->toHtml()
#10 /home/develop/prod/www/app/code/core/Mage/Core/Block/Abstract.php(585): Mage_Core_Block_Abstract->_getChildHtml('product_list', true)
#11 /home/develop/prod/www/app/code/core/Mage/Catalog/Block/Category/View.php(90): Mage_Core_Block_Abstract->getChildHtml('product_list')
#12 /home/develop/prod/www/app/design/frontend/rwd/default/template/catalog/category/view.phtml(134): Mage_Catalog_Block_Category_View->getProductListHtml()
#13 /home/develop/prod/www/app/code/core/Mage/Core/Block/Template.php(241): include('/home/develop/p...')
#14 /home/develop/prod/www/app/code/core/Mage/Core/Block/Template.php(272): Mage_Core_Block_Template->fetchView('frontend/rwd/de...')
#15 /home/develop/prod/www/app/code/core/Mage/Core/Block/Template.php(286): Mage_Core_Block_Template->renderView()
#16 /home/develop/prod/www/app/code/core/Mage/Core/Block/Abstract.php(923): Mage_Core_Block_Template->_toHtml()
#17 /home/develop/prod/www/app/code/core/Mage/Core/Block/Text/List.php(43): Mage_Core_Block_Abstract->toHtml()
#18 /home/develop/prod/www/app/code/core/Mage/Core/Block/Abstract.php(923): Mage_Core_Block_Text_List->_toHtml()
#19 /home/develop/prod/www/app/code/core/Mage/Core/Block/Abstract.php(641): Mage_Core_Block_Abstract->toHtml()
#20 /home/develop/prod/www/app/code/core/Mage/Core/Block/Abstract.php(585): Mage_Core_Block_Abstract->_getChildHtml('content', true)
#21 /home/develop/prod/www/app/design/frontend/rwd/default/template/page/2columns-left.phtml(81): Mage_Core_Block_Abstract->getChildHtml('content')
#22 /home/develop/prod/www/app/code/core/Mage/Core/Block/Template.php(241): include('/home/develop/p...')
#23 /home/develop/prod/www/app/code/core/Mage/Core/Block/Template.php(272): Mage_Core_Block_Template->fetchView('frontend/rwd/de...')
#24 /home/develop/prod/www/app/code/core/Mage/Core/Block/Template.php(286): Mage_Core_Block_Template->renderView()
#25 /home/develop/prod/www/app/code/core/Mage/Core/Block/Abstract.php(923): Mage_Core_Block_Template->_toHtml()
#26 /home/develop/prod/www/app/code/core/Mage/Core/Model/Layout.php(555): Mage_Core_Block_Abstract->toHtml()
#27 /home/develop/prod/www/app/code/core/Mage/Core/Controller/Varien/Action.php(390): Mage_Core_Model_Layout->getOutput()
#28 /home/develop/prod/www/app/code/core/Mage/Catalog/controllers/CategoryController.php(161): Mage_Core_Controller_Varien_Action->renderLayout()
#29 /home/develop/prod/www/app/code/core/Mage/Core/Controller/Varien/Action.php(418): Mage_Catalog_CategoryController->viewAction()
#30 /home/develop/prod/www/app/code/core/Mage/Core/Controller/Varien/Router/Standard.php(254): Mage_Core_Controller_Varien_Action->dispatch('view')
#31 /home/develop/prod/www/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/develop/prod/www/app/code/core/Mage/Core/Model/App.php(365): Mage_Core_Controller_Varien_Front->dispatch()
#33 /home/develop/prod/www/app/Mage.php(684): Mage_Core_Model_App->run(Array)
#34 /home/develop/prod/www/index.php(85): Mage::run('', 'store')
#35 {main}