As the black sun, the first introductionary mission takes you on a ground battle on Mustafar.
Part of the win conditions are that Darth Maul, Savage Opress, and Pre Visla have to survive.

My Savage Opress died, but the condition was not failed. I could continue the battle with Savage dead, normally the mission should have failed at that point.

I encountered a soft lock later on in the mission when the 3 terminals have been destroyed and you have to move Maul, Savage, and Pre Visla to a new location towards the right of the map. Of course Savage could not come since he was dead so I could not advance the mission any further.