---
title: "invalidationHandler(error:)"
framework: accessorytransportextension
role: symbol
role_heading: Instance Method
path: "accessorytransportextension/accessorytransportsession/eventhandler/invalidationhandler(error:)"
---

# invalidationHandler(error:)

Handles session invalidation.

## Declaration

```swift
func invalidationHandler(error: AccessoryTransportSession.Error?)
```

## Parameters

- `error`: An optional error that indicates the reason for cancellation.