Scenario crashing because "phantom" submarine group

Just when I was finishing the Black Sea scenario, and in the first attempt to run the scenario, the GE crashes (but be calm, I almost resolve it).
When loading the scenario in the GE, it don't l oad, and the GE crashes.
Opening the scenario with the SE, and don't remembering none bad "movement", I activate the "Analyze scenario" routine, ask by "Completness" (in the first essay I click also later in "complete analysis", and the SE crashed) and find, almost by hazard:
- "Submarine Group ZWU:
NO VARIABLE STARTING POINTS ENTERED.
NO PATH ENTERED."
- As in this concrete scenario I remember very well to have checked all the submarine groups alternate starting points and paths and speeds, I suspect a lot about it.
- I did search the Submarine Group ZWU with the space bar, as I'm almost sure is a "phantom" group (perhaps one of my errours creating a "vide" group, but I don't remember to did it in this scenario building).
- And bingo, selecting the Submarine Group ZWU with the space bar is a phantom group (the map reconduces it to UK zone).
- I simply delete it and the scenarios runs ok, but what moments of terror!

I post it if is of interest for debugging and so.