That's a bug that I'm aware of, there was a secret for beating that encounter, but the dialogue connection for that isn't defined correctly. Whoops.
There's also another bug I see a few people mentioned here, where if you're near or at the level cap, if an encounter will put you beyond that cap -- 50 Command Rank or 100 L.O.V.E., then the game freezes before you get the victory scene.
These should both be fixed in the next update.