The mod Realistic Reactors Reborn (2.0.27) caused a non-recoverable error.
Please report this error to the mod author.

Error while running event RealisticReactorsReborn::on_tick (ID 0)
RealisticReactorsReborn/scripts/util.lua:126: attempt to index global 'proxy' (a nil value)
stack traceback:
RealisticReactorsReborn/scripts/util.lua:126: in function 'respawn_furnace'
RealisticReactorsReborn/scripts/on_tick.lua:801: in function 'update_reactor_states'
RealisticReactorsReborn/scripts/on_tick.lua:111: in function 'func'
RealisticReactorsReborn/scripts/on_tick.lua:353: in function <RealisticReactorsReborn/scripts/on_tick.lua:178>