To reproduce: - Have a budget and a fund on it. - Spend more than what's in the fund - Confirm you allow to surpass the funds max. - Go to the budgets/funds list => SUCCESS: A negative value shows - Choose (on the fund's dropdown) to edit the fund => FAIL: Kaboom! Template process failed: undef error - round() overflow. Try smaller precision or use Math::BigFloat at /home/vagrant/kohaclone/Koha/Number/Price.pm line 64.
I'm closing this bug, because I belive there was a problem on the data, due to tests not cleaning up.