XRay Permissions page hangs on Save Changes

1. 1. 1. Steps to reproduce

1. Go to XRay as an admin user, log in, and go to the Admin > Security > Permissions page
2. edit an existing permission, click "Save Changes"

I get a loading spinner that hangs until I close the page. If I do close the page or go back, the permission is updated. 

In the console, I see : 
```
Request URL:
https://workivaeast-xray.jfrog.io/ui/permissions/developer
```
As the request that hangs indefinitely. 

In the console, I see a number of errors, the last of which is 
```
Failed to load resource: the server responded with a status of 500 (Internal Server Error)
```