Add a check to make sure that armor.resistances isn't nil before iterating through the resistances in data-updates.lua line 115

Without that nil check, the mod refuses to start when you have mods like https://mods.factorio.com/mod/FasterStart installed. Any armor without resistances would cause the same issue.

Oh, well. Hmmm... this mod https://mods.factorio.com/mod/IngosAdvancedStart does not cause that issue, as I've been consistently using it since that was added.

Odd. Anyway, yeah, that check will be added.

That mod has an empty
myEquipment.resistances = {}

Soo that might have been why it worked.