I want to reconstruct this build product: http://hydra.nixos.org/build/2708329

Restart build:
This build cannot be restarted.

Clone build (no changes):
Caught exception in Hydra::Controller::Build->clone_submit "Can't use string ("1") as a HASH ref while "strict refs" in use at /nix/store/pmdx74y2jd9h07bj1cvpi0cvccrxai2i-hydra-0.1pre1084-aa8bf56/libexec/hydra/lib/Hydra/Helper/AddBuilds.pm line 718."

Hydra 0.1pre1084-aa8bf56 (using nix-1.1)