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In my 2 player coop campaign we've found and tested the consistency of a bug. I'm playing as Tzeentch, the other player as Khorne. I paid the Disciples of the Maw to become my Vassals (through the "Balance offer" option). The other player gets the notice and the dilemma to declare war on me or make peace with the vassal. Whatever his choice, one of us crashes - every time.
No idea if this is happening with other forms of vassalization and we have no quick way to try. But we've run the same save with the same action a few times and it's happened in every one.
Let me know if you need a save or anything like that. Thanks!