sos-nextjs/pages/_error.js

import React from 'react'
import ErrorDisplay from '~/components/errorDisplay'

const ErrorPage = ({statusCode}) => (
  <>
    <ErrorDisplay error={error} />
  </>
)

ErrorPage.getInitialProps = ({ res, err }) => {
  let error = err;

  if(!error)
    error = new Error('Server Error')

  error.status = err.status || (res ? res.statusCode : (error.statusCode || 404))
  return { error }
}

export default ErrorPage