why get request causing error with fetch api code example

Example: fetch error handling js

export async function getStaticProps(context) {
  const res = await fetch(`https://...`)
  const data = await res.json()

  //use this statement for the program not to crush but go back to the home page
  if (!data) {
    return {
      redirect: {
        destination: '/',
        permanent: false,
      },
    }
  }

  return {
    props: {}, // will be passed to the page component as props
  }
}