# 80612: Duplicate Entry

Log Type: APPLICATION

Log Level: ERROR

## Description

This error occurs when you try to add a Proxy Participant with an `identifier` that already exists, or with an `identifier` that matches a participant you previously deleted. Proxy does not let you reuse the same `identifier` for a removed participant.

### Possible causes

* You submitted a Participant create request with an `identifier` that already exists.
* You submitted a Participant create request with an `identifier` that was previously used by a participant that has been deleted.

### Possible solutions

* Use a unique `identifier` when you create the participant.
* If you deleted a participant, create the replacement participant with a different `identifier`.
* Review your participant creation logic to make sure your application does not submit the same `identifier` again after the participant already exists or has been removed.

#### Additional resources

* [Participant resource](/docs/proxy/api/participant)
* [Session Resource](/docs/proxy/api/session)
* [Proxy Quickstart](/docs/proxy/quickstart)