The mod Tycoon (0.2.7) caused a non-recoverable error.
Please report this error to the mod author.
Error while running event tycoon::on_research_finished (ID 18)
LuasEntity API call when LuaEntity was invalid
stack traceback:
[C]: in function ' index'
__tycoon/control.lua:493: in function<tycoon/control.lua:482>