ToME: the Tales of Maj'Eyal

Can we have skeletons barred from the part of this quest where they need to enter a dream (lower level blue pillar), or fix the problem please?
It doesn't work and just segmentation faults out.
Same happens to the goul.
I suspect it may be because they are undead?

I thought skeletons were unaffected in the caldera since they do not breathe. Guessing something recent broke it