Thanks for the useful mod. I experienced a crash with the following report.

The mod Circuit Visualizer (2.0.2) caused a non-recoverable error.
Please report this error to the mod author.

Error while running event circuit_visualizer::on_tick (ID 0)
circuit_visualizer/control.lua:450: attempt to index a nil value
stack traceback:
circuit_visualizer/control.lua:450: in function 'update_network_ids'
circuit_visualizer/control.lua:669: in function 'on_connections_changed'
circuit_visualizer/control.lua:708: in function 'on_tick'
circuit_visualizer/control.lua:807: in function <circuit_visualizer/control.lua:803>