The mod Smart Belt Immunity (0.1.0) caused a non-recoverable error.
Please report this error to the mod author.
Error while running event smart-belt-immunity::on_tick (ID 0)
smart-belt-immunity/control.lua:2: attempt to index local 'grid' (a nil value)
stack traceback:
smart-belt-immunity/control.lua:2: in function 'disable_belt_immunity'
smart-belt-immunity/control.lua:29: in function <smart-belt-immunity/control.lua:11>
Can be easily fixed by checking for the grid being present before accessing it.