guillaumepotier/Parsley.js — pull request #657 by froodian (2014-05-27 15:38:08+00:00)
Title: Fixes guillaumepotier/Parsley.js/#649 - Cannot read property '' of undefined

I was able to reproduce this within my own codebase - possibly something having to do with calling destroy multiple times, or destroy on forms where fields have been removed? Either way, this defensiveness fixes it.