Last modified: 2009-01-14 00:26:36 UTC
When viewing a diff on a page with no other items in the history (see link), it shows a link to the newer edit. Upon clicking, it shows the new edit next to the old, with no differences (obviously). If there is only one edit in the history, I think disabling the diff interface entirely would be the best course of action.
*** Bug 8696 has been marked as a duplicate of this bug. ***
Fixed in r45723