[Bug] Error after updating default user

[svenvg93]

Describe the bug
When you update the default user via the user menu on the left side an error is shown when click on Dashboard.
To Reproduce
Steps to reproduce the behavior:

1. Go to http://speedtest-tracker/admin/users
2. Click on admin@example.com user
3. Change all the information and save
4. Click on Dashboard
5. See error

Expected behavior
Nice redirect to the login page.

Environment (please complete the following information):

• OS: Ubuntu Docker
• Architecture: AMD64
• Browser Safari
• Version 0.25.0 (but also in all earlier versions)

Screenshots