ToME: the Tales of Maj'Eyal

I was fighting Myssil, the boss of Zigur, after being teleported there by the Grand Corruptor. I ended up dying on the same turn as her, and I was transported to the Eidolon Plane. The a box popped up saying "Assign Hexes tree to which party member?" with no options, and I had to quit out. When I reloaded the game, I was back in the Eidolon Plane, but I didn't have the Hexes tree. It not a big deal since I didn't plan to unlock it anyway, and this is an edge case, but I figured I should report it.