In swank-sbcl FRAME-LOCALS implementation (which I have some backend code calling to generate an alternate debugging screen) it attempts to loop across a vector that apparently can be null. "The value NIL is not of type VECTOR."
I'm kind of surprised this function wasn't being called for the main SLDB; I haven't dug any further. The attached patch (just a when guard) fixes it for me.
Quick link to function: http://github.com/nablaone/slime/blob/master/swank-sbcl.lisp#L1141 I had just updated: Slime from d4c8a50 (Mon Sep 21) to b2ef1cf (Tue Dec 1) from git mirror at http://github.com/nablaone/slime/ SBCL from 1.0.31 -> 1.0.33
Nathan Bird