duplicate key value violates unique constraint "isabelle_build_sessions_pkey"

[Florian Haftmann]

There is a reproducible break down in the build system:

https://build.proof.cit.tum.de/build?id=038ecd8c-6a3e-4e55-bacd-a455cf7f6b40

A few weeks ago there was a similar break down.

What is going on here?

Thanks a lot,
	Florian
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