Whatever nation I start, there are no buildings in city menu. I've tried to track the error through Lua.log, and this is what I found:
ProductionPopup.lua:105: bad argument #2 to '?' (Key must be of type 'number' or 'string'.)
Do you need more information on that?
ProductionPopup.lua:105: bad argument #2 to '?' (Key must be of type 'number' or 'string'.)
Do you need more information on that?