When selecting a signal in the choose signal component, the game crashes with the following error. The interesting part is, it happens only on my cargo load/unload stations, not the the fluid load/unload stations. There the choose signal component works fine and as expected. The compact circuit models were already created in an earlier save, where everything worked and are now imported into a new game (with different mod list). So a few combinators were missing in the compact circuit, I adapted it to the new game and thought I was done. I can not pinpoint the problem why the cargo stations are crashing and the fluid stations are not. The missing combinators were only decider combinators, so nothing fancy there.

The mod Compakt circuits (2.0.21) caused a non-recoverable error.
Please report this error to the mod author.

Error while running event compaktcircuit::on_gui_elem_changed (ID 80)
__compaktcircuit__/scripts/input.lua:1491: attempt to index local 'filter' (a string value)
stack traceback:
    __compaktcircuit__/scripts/input.lua:1491: in function 'setter'
    __compaktcircuit__/scripts/input.lua:1449: in function 'set_values'
    __compaktcircuit__/scripts/input.lua:1548: in function 'save'
    __compaktcircuit__/scripts/input.lua:965: in function 'handler'
    __compaktcircuit__/scripts/tools.lua:300: in function 'previous'
    __compaktcircuit__/scripts/tools.lua:299: in function <__compaktcircuit__/scripts/tools.lua:298>

To test, the smart stations and the model library can be imported from https://factorioprints.com/view/-OXKy4sVfgYyfimNAS3_

And here is the save, if that's easier: https://we.tl/t-XPhIvGm8Xd

Hmm, interesting. It's not, that the cargo stations are somehow broken, the crash happens with every item signal, but I can still set the cargo to a fluid signal. That's why my fluid stations did not crash.

Bug seems to be introduces with 2.0.21, 2.0.20 works fine again as a workaround.

Sorry for the crash. Should be fixed in 2.0.22.

Thanks, works again