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next.js/errors/popstate-state-empty.md
Tim Neutkens 0dd2b2aa74
Add warning for broken popstate (#5000)
* Add warning for undefined url and as coming from popstate

* Use consistent url

* Fix err.sh link in test

* Rename `inital` => `initial`
2018-08-24 12:30:27 +02:00

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# `popstate` called with empty state
#### Why This Error Occurred
When using the browser back button the popstate event is triggered. Next.js sets
`popstate` event triggered but `event.state` did not have `url` or `as`, causing a route change failure
#### Possible Ways to Fix It
The only known cause of this issue is manually manipulating `window.history` instead of using `next/router`
### Useful Links
- [The issue this was reported in: #4994](https://github.com/zeit/next.js/issues/4994)