I'm working on a project where we're using TDS. In my environment, I have a duplicate folder item that showed up under the root of my site. It's not unheard of to have issues like this when working on a team using TDS. However, the item is broken. If I click on it, Sitecore shows a dialog showing a .Net Object not set to an instance of an object error. This happens if I try to interact with the item via a right or left click.
If I run a sync with Sitecore from Visual Studio, TDS doesn't see the item at all. Any thoughts as to how it goes there and how to remove it?
UPDATE: to clarify, the item was "duplicate" in name only, which is assumed, but since I was unable to interact with the item, I couldn't see it's ID. However, using Sitecore Rocks, I was able to interact with the item and confirm that it was a second folder with the same name (different ID), created by another dev. Using Rocks, I removed it and all seems good. However, if anyone has experienced this error on an item via Content Editor, I'd like to understand more about how this can happen.