ToME: the Tales of Maj'Eyal

Found an bug on an alchemist in B37 (on a Mac, hence the older beta). When trying to switch control to the Golem I get the message "Lua Error:/mod/ai//party.lua:25:bad argument"

I just got this same bug in [B38] on win7. In my current alchemist save, it crashes this way every time I try to switch to the golem, spewing an infinite series of lua error logs (same error code as the OP).