When editing a signal symbol value, which does not have a stack size, the game crashes.

The mod LTN Combinator Modernized (1.0.4) caused a non-recoverable error.
Please report this error to the mod author.

Error while running event LTN_Combinator_Modernized::on_gui_text_changed (ID 2)
LTN_Combinator_Modernized/script/gui.lua:335: attempt to perform arithmetic on field 'stack_size' (a nil value)
stack traceback:
LTN_Combinator_Modernized/script/gui.lua:335: in function 'handler'
flib/gui.lua:390: in function <flib/gui.lua:376>

Screenshot:
https://imgur.com/a/Ap6hK8P