# What does the VARTA error `session_already_ended` mean?

The session is closed and can't accept another turn.


**HTTP status:** `409`  ·  **Type:** `invalid_request_error`

## What it means

The session is closed and can't accept another turn.

## What causes it

Raised by `POST /v1/sessions/{session_id}/turn` when the session's `ended_at` is already set (`backend/app/api/v1/sessions.py`).

## What to do

Open a new session with `POST /v1/agents/{agent_id}/load` rather than reusing one that has ended.