We have just noticed that when a customer tries to login they get the standard error message: "There has been an error processing your request". However, if you hit the back button you are taken to the site and the login has proceeded correctly.
I'm not actually sure how long this problem has been going for - we wouldn't get many customers logging in, but it was first noticed today after upgrading to 1.9.2.2. I rolled back to 1.9.2.1 but it is still happening.
The error report always says:
a:5:{i:0;s:70:"Item (Mage_Catalog_Model_Product) with the same id "292" already exist";i:1;s:3585:
"#0 /home/grantvio/public_html/app/code/core/Mage/Eav/Model/Entity/Collection/Abstract.php(265): Varien_Data_Collection->addItem(Object(Mage_Catalog_Model_Product))
#1 /home/grantvio/public_html/app/code/core/Mage/Eav/Model/Entity/Collection/Abstract.php(1055): Mage_Eav_Model_Entity_Collection_Abstract->addItem(Object(Mage_Catalog_Model_Product))
#2 /home/grantvio/public_html/app/code/core/Mage/Eav/Model/Entity/Collection/Abstract.php(871): Mage_Eav_Model_Entity_Collection_Abstract->_loadEntities(false, false)
#3 /home/grantvio/public_html/app/code/core/Mage/Catalog/Helper/Product/Compare.php(263): Mage_Eav_Model_Entity_Collection_Abstract->load()
#4 /home/grantvio/public_html/app/design/frontend/default/helloresponsive/template/catalog/product/compare/sidebar.phtml(30): Mage_Catalog_Helper_Product_Compare->getItemCollection()
#5 /home/grantvio/public_html/app/code/core/Mage/Core/Block/Template.php(241): include('/home/grantvio/...')
#6 /home/grantvio/public_html/app/code/core/Mage/Core/Block/Template.php(272): Mage_Core_Block_Template->fetchView('frontend/defaul...')
#7 /home/grantvio/public_html/app/code/core/Mage/Core/Block/Template.php(286): Mage_Core_Block_Template->renderView()
#8 /home/grantvio/public_html/app/code/core/Mage/Core/Block/Abstract.php(919): Mage_Core_Block_Template->_toHtml()
#9 /home/grantvio/public_html/app/code/core/Mage/Core/Block/Text/List.php(43): Mage_Core_Block_Abstract->toHtml()
#10 /home/grantvio/public_html/app/code/core/Mage/Core/Block/Abstract.php(919): Mage_Core_Block_Text_List->_toHtml()
#11 /home/grantvio/public_html/app/code/core/Mage/Core/Block/Abstract.php(637): Mage_Core_Block_Abstract->toHtml()
#12 /home/grantvio/public_html/app/code/core/Mage/Core/Block/Abstract.php(581): Mage_Core_Block_Abstract->_getChildHtml('left', true)
#13 /home/grantvio/public_html/app/design/frontend/default/helloresponsive/template/page/2columns-left.phtml(50): Mage_Core_Block_Abstract->getChildHtml('left')
#14 /home/grantvio/public_html/app/code/core/Mage/Core/Block/Template.php(241): include('/home/grantvio/...')
#15 /home/grantvio/public_html/app/code/core/Mage/Core/Block/Template.php(272): Mage_Core_Block_Template->fetchView('frontend/defaul...')
#16 /home/grantvio/public_html/app/code/core/Mage/Core/Block/Template.php(286): Mage_Core_Block_Template->renderView()
#17 /home/grantvio/public_html/app/code/core/Mage/Core/Block/Abstract.php(919): Mage_Core_Block_Template->_toHtml()
#18 /home/grantvio/public_html/app/code/core/Mage/Core/Model/Layout.php(555): Mage_Core_Block_Abstract->toHtml()
#19 /home/grantvio/public_html/app/code/core/Mage/Core/Controller/Varien/Action.php(390): Mage_Core_Model_Layout->getOutput()
#20 /home/grantvio/public_html/app/code/core/Mage/Customer/controllers/AccountController.php(119): Mage_Core_Controller_Varien_Action->renderLayout()
#21 /home/grantvio/public_html/app/code/core/Mage/Core/Controller/Varien/Action.php(418): Mage_Customer_AccountController->indexAction()
#22 /home/grantvio/public_html/app/code/core/Mage/Core/Controller/Varien/Router/Standard.php(254): Mage_Core_Controller_Varien_Action->dispatch('index')
#23 /home/grantvio/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))
#24 /home/grantvio/public_html/app/code/core/Mage/Core/Model/App.php(365): Mage_Core_Controller_Varien_Front->dispatch()
#25 /home/grantvio/public_html/app/Mage.php(684): Mage_Core_Model_App->run(Array)
#26 /home/grantvio/public_html/index.php(83): Mage::run('', 'store')
#27 {main}";s:3:"url";s:28:"/index.php/customer/account/";s:11:"script_name";s:10:"/index.php";s:4:"skin";s:7:"default";}
