NullPointerException in /course/.../participants/create

Sentry Issue: QUEUE-DY

NullPointerException: None
    at nl.tudelft.ewi.queue.model.User.guaranteeValidNetId(User.java:325)
    at nl.tudelft.ewi.queue.validator.ParticipantValidator.validate(ParticipantValidator.java:48)
...
(138 additional frame(s) were not displayed)