Can't access params in sequence setup

Hi. I'm getting bad access if I try to access a parameter in sequence setup, even though sequence setup is passed the params array and is called after params setup function. Is there a reason that params can't be access here?

I was hoping to have a param slider called seed, and then in sequence setup use that param as the seed. If the seed slider changes, then I'll call SequenceResetup.

Thanks.