Last modified: 2014-07-16 10:55:20 UTC
When after a history merge a page no longer has revisions, a redirect is created, but this redirect has a byte diff, which looks wrong. Look at http://de.wikipedia.beta.wmflabs.org/w/index.php?title=Testvereinigungsseite&action=history where a diff from -1 is shown, but there is no page you can diff this to. The redirect should have a rev_parent_id of 0 to avoid this.