Crash while reading output wire

program:

clr
clr mem
mov r1 out1

The mod fCPU: Programmable combinator (0.4.33) caused a non-recoverable error.
Please report this error to the mod author.

Error while running event fcpu::on_tick (ID 0)
__fcpu__/src/cpu/io/control.lua:3: attempt to concatenate field 'name' (a nil value)
stack traceback:
	__fcpu__/src/cpu/io/control.lua:3: in function 'signalToStr'
	__fcpu__/src/gui/base.lua:36: in function 'GUI_signalToTooltip'
	__fcpu__/src/gui/main.lua:384: in function 'GuiWidgetUpdate'
	__fcpu__/control.lua:52: in function 'update_gui'
	__fcpu__/control.lua:91: in function <__fcpu__/control.lua:65>