> ## 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.

# E1409 — Transfer hook attempted reentrancy

> Transfer hook attempted reentrancy

# E1409 — Transfer hook attempted reentrancy

| Property     | Value                    |
| ------------ | ------------------------ |
| **Code**     | `1409`                   |
| **Slug**     | `E1409`                  |
| **Category** | `token` (Token (CIP-20)) |
| **CIP**      | CIP-20 §8                |

## What happened

Transfer hook attempted reentrancy.

## Why it happened

The transfer hook tried to call back into the token registry, which is forbidden.

## How to fix

Reentrancy from transfer hooks is forbidden by CIP-20 §8. Restructure the hook logic.

## Receipt example

```json theme={null}
{
  "code": 1409,
  "slug": "E1409",
  "category": "token",
  "what": "Transfer hook attempted reentrancy",
  "fix": "Reentrancy from transfer hooks is forbidden by CIP-20 §8.",
  "docs_url": "https://docs.cowboy.inc/errors/E1409"
}
```

***

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