# Make PageView.controller nullable

> PageView.controller is now nullable.




:::important
These breaking change docs are accurate, as of the release
under which they are published. Over time, the
workarounds described here might become inaccurate.
We don't, in general, keep these breaking change docs up
to date as of each release.

The [breaking change index file](/release/breaking-changes)
lists the docs created for each release.
:::


## Summary

If a controller isn't provided in the constructor,
the `controller` member is `null`. This makes
`PageView` and its `controller` property consistent with other widgets.

## Migration guide

Before:

```dart
pageView.controller.page
```

After:

```dart
pageView.controller!.page
```

## Timeline

Landed in version: 3.19.0-12.0.pre<br>
In stable release: 3.22.0

## References

Relevant issues:

* [PageView uses global controller, that is never disposed. (Issue 141119)][]

[PageView uses global controller, that is never disposed. (Issue 141119)]: https://github.com/flutter/flutter/issues/141119