I getting this error for my online collection tab on Magento. 1.9.1
Fatal error: Call to a member function getBackendType() on a non-object in /home/*****/public_html/app/code/core/Mage/Log/Model/Resource/Visitor/Online/Collection.php on line 72
I can usually figure this out, but I don't know much about the online customers tab in Magento. It started happening when we went to our 4 server cluster a couple months ago.