DecileHub dashboard crashes & redirects to 500 page (urgent)

This is an issue with one of our team members, but not the other. It happens on multiple browsers, on different machines, and we have tried completely clearing the cache, cookies, local storage, even using the browser Inspector mode to root out any saved values. I will provide more info to @Robert Nipshagen . But just for the record, here are the steps we take to replicate on different machines and browsers:

1. Quit browser application & open new browser in Incognito mode
2. Log into https://decilehub.com with the affected user's credentials