# DuplicateHandlerError

> **Class** in `langgraph_sdk`

📖 [View in docs](https://reference.langchain.com/python/langgraph-sdk/encryption/DuplicateHandlerError)

Raised when attempting to register a duplicate encryption/decryption handler.

## Signature

```python
DuplicateHandlerError()
```

## Extends

- `Exception`

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[View source on GitHub](https://github.com/langchain-ai/langgraph/blob/13f2ecc84bdf257af19b370a2f03a0f02d15674d/libs/sdk-py/langgraph_sdk/encryption/__init__.py#L35)