I had a flight plan set to Unknown Object (I think it was called), because I supposed that must be the satellite I was supposed to repair. I could be wrong about where I was supposed to go, I didn't see anything else but other stations in the destination list. Aside from that, the flight plan was generated and locked in just like in the first mission. I haven't played the game since, but I remember the crash happened as I tried to actually launch, not during planning.
Object in Space is the current placeholder target for recovery missions, so that would make sense. What I find really odd is the timing… If it would have crashed if you were departing from the object after doing the mission, that I could understand, because I did indeed just fix a bug in the last release that could cause such a crash. But when departing from the station, that seems really odd. I’ll have to play around a bit and see if I can reproduce this somehow.