Cannot register account ("Account already exists") #1029

Solid Server Versions:

• 5.0.0-beta.2
• 5.0.0-beta.3
• 5.0.0-beta.4

Expected Behaviour: After setting up a solid server it should be possible to register an account

Actual Behaviour: When trying to register any account by submitting the registration form, the following error occurs: "Account already exists"

Steps to reproduce:

1. Visit https://angelo.veltens.org or set up your own solid-server on version 5.0.0-beta.3
2. Click Register
3. Fill out the registration form
4. Click Submit
5. See the mentioned error message on top of the page