I've had a very similar experience myself. I did not crash so quickly but I have consistently crashed, near the end of that boss fight, twice in one play session.
I'm on PC (bought through steam), I was playing Mikah both times, there was an antagonist both times, and the only other consistent character was Alicia (I think there was one in the first match, definitely in the second). I don't recall doing anything specific before the crashes, just running and gunning; no switches or grapples.
Edit: Figured I'd give it another shot to see if it'd crash with other factors (it did, so that's crash #3) and I can rule out the raiders and antagonist; they have no effect on the crash as far as I can tell.
Hopefully this bug can be caught soon as I don't have those blueprints yet and I'm about to have the antagonist rank to make them.