It should be easy, but it's not working for me. The GECK wiki explained it. I am to enter the data for this formula SetEssential BaseID Flag. Defender Morgan's BaseID is DefenderMorgan. But the console says that is not a valid ID. What have you done, Bethesda? Did you remove our only way of saving npcs who are at risk everyday, especially this npc who has the potentially worst guard duty ever?

Thats her Editor ID, Base ID is different.

Base ID's are always numbers, in the case of Morgan, her Base ID is 00043DEB. Try that.

Protip: If you use FOSE, you can get a base id in-game by clicking on the npc and entering gbo into the console.