---
title: No Router Instance
---

## Why This Error Occurred

During Pre-rendering (SSR or SSG) you tried to access a router method `push`, `replace`, `back`, which is not supported.

## Possible Ways to Fix It

In a function Component you can move the code into the `useEffect` hook.

In a class Component, move any calls to router methods to the `componentDidMount` lifecycle method.

This way the calls to the router methods are only executed in the browser.