Problem running SPheno with low kappa using munuSSM

[paulinaknees]

Dear Florian,
I'm trying to run the munuSSM with one generation of right handed neutrinos. I need to use low values of kappa, but when I use values of order ~10^(-3) the program does not give a realiable output. Even if it runs with several warnings and NaN:
Calculating one-loop decays of Sd/Su
NaN in C0_IR
ffxc0i: infra-red divergent threepoint function, working with a cutoff 1.0
C0 lost 1097088313 digits (m1 = 0.0)

Calculating one-loop decays of hh/FuH/pm
NaN in C0_IR

In the output one of the higgs's mass is equal to zero and that can't be right. I have already suppress de calculation of one-loop correction to the mass spectrum, but the problem persists.

Thank you in advance,
Bests

Paulina