ERROR: failed to re-find parent key in "sl_seqlog_idx" for deletion target

Hi!

Hope anyone can shed some light on this. I was struck by the following error in the slony log but I believe it's not a slony error, rather that slony triggers an error in PostgreSQL. The error message is:

cleanupThread: vacuum analyze sl_seqlog; - ERROR: failed to re-find parent key in "sl_seqlog_idx" for deletion target

I've tried to find some posts about it and I could only find one post where Tom states that reindexing should do the trick, but there is no answer that reindexing did solve the case. The post is here:
http://archives.postgresql.org/pgsql-bugs/2007-08/msg00035.php

Well, it is supposed to have been fixed to version 8.2, but it's a PostgreSQL 8.2.4 x86_64 server running on Debian that triggers the error.

Thank in advance!
// John