Error : 422 Unprocessable Entity

Hi there

We have an application that is creating a new support ticket.

We have a single user that when they create a new ticket we getting the above response.

```

Uh oh, an error occurred: Client error: `POST https://domain.zendesk.com/api/v2/tickets.json` resulted in a `422 Unprocessable Entity` response: {"error":"RecordInvalid","description":"Record validation errors","details":{"requester":[{"description":"Requester: is (truncated...) [details] {"error":"RecordInvalid","description":"Record validation errors","details":{"requester":[{"description":"Requester: is invalid","error":"InvalidValue"}]}}

```

This is only occurring with a specific user and no other user on the system. It makes me wonder if it's something related to the specific user?