# EmptyChannelError

> **Class** in `langgraph.checkpoint`

📖 [View in docs](https://reference.langchain.com/python/langgraph.checkpoint/base/EmptyChannelError)

Raised when attempting to get the value of a channel that hasn't been updated
for the first time yet.

## Signature

```python
EmptyChannelError()
```

## Extends

- `Exception`

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[View source on GitHub](https://github.com/langchain-ai/langgraph/blob/398d6cc59d4cf81ab23c09f037e9f521c3fedcd6/libs/checkpoint/langgraph/checkpoint/base/__init__.py#L853)