Please, I love this mod, but I also love the belt update. If I have both send this error when I send material between planets.

El mod Belt Upgrader (2.0.2) causó un error irrecuperable.
Por favor, informe de este error al autor del mod.

Error while running event BeltUpgrader::on_nth_tick(180)
BeltUpgrader/control.lua:189: attempt to index field 'items_to_place_this' (a nil value)
stack traceback:
BeltUpgrader/control.lua:189: in function 'upgrade'
BeltUpgrader/control.lua:77: in function <BeltUpgrader/control.lua:61>

I've fixed it, sorry for the inconvenience. Modify the control.lua of the betlUpgrade so that it would not throw the error and take as nill

I am glad you figured it out, but I'm not sure what my mod could have been doing. This seems like an issue with BeltUpgrader.