<obouda@email.cz> writes:
> we reached the exactly same problem after upgrading to PostgreSQL 11 - the
> server crashed on a DELETE statement with a trigger. We also observed an
> AFTER DELETE trigger receiving NULL values in OLD. Now I see the problem
> seems to be solved (theoretically). Unfortunately, we are not able to build
> the server with the patch, so we cannot confirm that. However, when we just
> copied the database (within the same server), the same DELETE executed on
> the copy with no problems.
Yeah, dump/reload would make the problem go away.
> I would like to ask, however: could the same problem arise from an UPDATE
> statement (also on a table with an AFTER trigger), or would that be another
> bug (technical details below)?
Same bug.
regards, tom lane