Trying to self-order crashes the website

[JAicewizard]

Describe the bug

When clicking the "Place order" button on the website the website crashes

How to reproduce

1. Go to https://staging.thalia.nu/events/future-event-2025/
2. click the food order
3. click order food

Expected behaviour

Be able to order

[ColonelPhantom]

Can you add a Sentry link? EDIT: is it this one? https://thalia.sentry.io/issues/7495267673/?query=is%3Aunresolved&referrer=issue-stream

Looks like the issue is the user not having a birthday. Should never happen IRL, but I guess still annoying.