`popstate` called with empty state

Why This Error Occurred

When using the browser back button the popstate event is triggered. Next.js sees a popstate event being 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. Starting from version 9.5, Next.js will ignore popstate events that contain event.state not created by its own router.

Useful Links

• The issue this was reported in: #4994