A KeePass plugin that downloads and stores favicons. A favicon is the little icon / logo used to identify many websites, typically displayed in the browser's address bar, bookmark list and on tabs.
I can't replicate this. Can you run KeePass in debug mode to try to get some more information about this null reference error? And provide some information about your environment please.
There is a null reference error when trying to get favicons for http://www.adverts.ie/ even though http://www.adverts.ie/favicon.ico exists...