dev/start.sh fails with PGPASSWORD: unbound variable

Created by: felixfbecker

I suddenly always get this error on ./dev/start:

22:11:05   postgres_exporter | ./dev/postgres_exporter.sh: line 24: PGPASSWORD: unbound variable
22:11:05   postgres_exporter | Terminating postgres_exporter

My local database has no password (trust auth), so I don't know what I would be setting PGPASSWORD to?