Hi, here is the upstream patch fixing the issue :
https://github.com/fplll/fpylll/commit/ede1e459f0662a0940dca6366aba20d47183a4a0 I tought they'd have already released the new version with this in, but I should have waited until that was done... And since this patch needs other changes to apply, I can't just add it. I'll work on it as soon as upstream will have released the new version. Sorry, JP