as above, have one crystal in the mines, when I returned to the station I got a crash, every load after that one I also get a crash.

Logs:
Object reference not set to an instance of an object.
WTF
at CoOpSpRpG.CrystalMonster.tick(CrystalBranch branch, Boolean canResonate)
at CoOpSpRpG.CrystalMonster.tick(CrystalBranch branch, Boolean canResonate)
at CoOpSpRpG.CrystalMonster.tick(CrystalBranch branch, Boolean canResonate)
at CoOpSpRpG.CrystalMonster.tick(MicroCosm cosm)
at CoOpSpRpG.MicroCosm.updateCrew(Single elapsed)
at CoOpSpRpG.MicroCosm.update(Single elapsed)
at CoOpSpRpG.PROCESS_REGISTER.realtimeUpdate(Single elapsed)
at CoOpSpRpG.PROCESS_REGISTER.update(Single elapsed)
at CoOpSpRpG.SCREEN_MANAGER.Update(GameTime gameTime)
at CoOpSpRpG.Game1.Update(GameTime gameTime)
Void tick(CoOpSpRpG.CrystalBranch, Boolean)