I've set up two saves with the same modded civilisations, one where I played as one and one where I watched AIs, in both saves Tanzania crashed the game once their turn started, around the Industral/Modern age.

There are no real correlations with the two saves as checked by IGE (on AI only they built their UB while having an unit that creates deer resource with their ability, which I thought was the reason for a crash, however the second save [where I was playing as one of the civs], Tanzania was neither building their UB in that turn, neither they had the unit)

My second best guess is that their UA is somehow crashing when they adopt Ideology? That's the only other "crashable" thing I could think of, considering it was in the between Industrial and Modern era adds fuel to that theory.