I think I'm getting the same here
The mod Inventory Sensor (2.0.4) caused a non-recoverable error.
Please report this error to the mod author.
Error while running event Inventory Sensor::on_tick (ID 0)
Filter conflicts with filter in slot 2.
stack traceback:
[C]: in function 'set_slot'
Inventory Sensor/control.lua:511: in function 'UpdateSensor'
Inventory Sensor/control.lua:208: in function <Inventory Sensor/control.lua:184>
This happens when I place the combinator against a centrifuge and wire it to the inserter putting U-235 into the centrifuge U-235<40 is the condition on the inserter. This is a very useful mod. I can live without it but would hope you can find some time to look at it.