Contacts page is broken

[jessegeens]

When creating a new account, then going to the podbrowser, then clicking the "contacts" button, the page returns an error:

Storing the Resource at [https://pod.inrupt.com/jesssegeens/contacts/people.ttl] failed: 
[412] [Precondition Failed]. The SolidDataset that was sent to the Pod is listed below. 
# SolidDataset (no URL yet) 
## Thing (no URL yet — identifier: `#this`) <empty> (0 new values added / 0 values removed)