javascript error in coursepress

I am getting an error when trying to self-enroll in an open exam.

I am logged in to Wordpress as a "subscriber"

This is the error I get when clicking "Next" on the exam in question at

https://www.proactiveprofessional.com/courses/proactive-support-professional/units/untitled/

Uncaught SyntaxError: Unexpected token B in JSON at position 101
    at JSON.parse (<anonymous>)
    at front.js?ver=2.0.5:751
(anonymous) @ front.js?ver=2.0.5:751