thankyou for the catch! i think i’ve addressed the issue (although its more of a work around for some quirky behaviour that i don’t fully understand described here for anyone interested: context.object is None in execute function)
anyway i’m going to edit the first post with a fixed version (look for 1.4.3) - note you’ll still have to toggle either the scene, armature or a wiggle bone to get it to refresh the list of bones to wiggle.