Cannot read property 'pathname' of null

RouterのMockを作成せずに、
Material-UIの <Link> を使うと上記エラーがでる。

その対処法。

.storybook/nextRouterMock.js

import * as nextRouter from 'next/router'

nextRouter.useRouter = () => ({
  route: "/",
  pathname: "/"
});

nextRouter.router = {
  push: () => {},
  prefetch: () => new Promise((resolve, reject) => {}),
};

.storybook/config.js

import './nextRouterMock';

参考
https://gist.github.com/novascreen/f1c44ead31e5a494556793be2c408840