> ## Documentation Index
> Fetch the complete documentation index at: https://docs.cowboy.inc/llms.txt
> Use this file to discover all available pages before exploring further.

# E1225 — Duplicate message id

> Duplicate message id

# E1225 — Duplicate message id

| Property     | Value               |
| ------------ | ------------------- |
| **Code**     | `1225`              |
| **Slug**     | `E1225`             |
| **Category** | `runtime` (Runtime) |

## What happened

Duplicate message id.

## Why it happened

A message with this id was already delivered.

## How to fix

Use a fresh message id.

## Receipt example

```json theme={null}
{
  "code": 1225,
  "slug": "E1225",
  "category": "runtime",
  "what": "Duplicate message id",
  "fix": "Use a fresh message id.",
  "docs_url": "https://docs.cowboy.inc/errors/E1225"
}
```

***

<Card title="All Error Codes" icon="list" href="/errors/overview">
  View the complete error code reference
</Card>