Tim Clarke <tim(dot)clarke(at)minerva-analytics(dot)info> writes:
> Last night for the first time our pg_dump backup threw this error for
> the first time. Repeated runs this morning consistently throw it too.
That's not supposed to happen. Can you create a test case, by any chance?
Presumably, it's triggered by some database schema change you made since
the last successful dump.
regards, tom lane