1 - Create two layers
2 - Add an FX to one of the layers (the effects window will appear)
3 - Remove the layer with the effect (the effects window will continue to show the effect)
4 - Remove (do not close de Effects window) the effect from the effect window.
5 - CRASH occurs
In addition, the action of modifying an effect parameter is not automatically eliminated.
As you can see in this image, the layer has no effects but the action continues to refer to the effect that the layer previously had.