Is it happening often? I very rarely have that problem when clicking on a castle or piece. I've noticed that it seems to happen when I'm clicking and moving my mouse rapidly. Hence, I try not to be too speedy on the campaign map. If you discover the cause, please share it. It's still a mystery to me.
An unassociated and consistent crash involves picking up an assassin unit (ninja, geisha) on the same turn that its target has been assassinated by another unit. To avoid this, never pick up a unit that is en route to kill a target that has just been killed. If you do, the game will CTD the instant you drop the piece. Wait until the next turn before retargeting or moving those units.
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