This has been reported to happen in very rare cases after rebellions, where the yubtseb oliphaunts are spawned contrary to all the rules we set for it. You can bypass it by autocalcing the battle (using auto_win if you're sure you would have won).
I'd actually much prefer to remove them from the roster entirely, but for some strange reason we keep them in order to avoid crashing the game when typing the cheat code. It still causes crashes later if using the cheat code.
If you're getting this when starting the game or a campaign however, you should run the validation tool and probably there will be some files you should restore from the EB installer and/or from the fixes posted in the thread linked by my sig.
Bookmarks