Leaving a partt you created.. How?

[SamSmoot]

I, and others have seen this. You need to leave the party you're lead in, but when you click another player and select promote to lead, it generates an error. Same thing happens if you just try to leave by the same method. The only exit option is to disband.
If I'm leaving to log off, I just do so with the party still up, hoping it will just go on without me.

Is there way to leave without disbanding?