Found by Vedolin of Intertek steps to reproduce: 1. Load https://marketplace-dev.allizom.org/developers/app/test-app-turtle4495/payments/ 2. Try to change from Free to Paid actual behavior: Changing from Free to Paid app fails with TypeError: can't convert undefined to object devreg-min.js:10
I'll investigate this and find out what the cause is.
Verified as fixed on MP-dev on FF38 (Win 7). Postfix screecast http://screencast.com/t/oj3fjRFIgV5p Closing bug.