Nextjs Error occurred prerendering pages

Question

 Export encountered errors on following paths:
        /blogs/categorias/[slug]
TypeError: Cannot read property '0' of undefined

  export const getStaticPaths = async () => {
  const res = await fetch(`api/categorias/`);
  const postAwait = await res.json();
  
  const paths = postAwait.map(node => {
    return { params: { slug: node.slug }}
  });

  return {
    paths,
    fallback: true,
  }
  
}


export const getStaticProps = async (context) => {
  const { slug } = context.params;  
  const res = await fetch(`api/categorias?slug=${slug}`);
  const data = await res.json(); 

  return {
    props: {
      singlePost: data[0]
    },
    revalidate: 1,
  };
}

console.log on date: i want to return what is inside blogs but for that I need to put date[0] and that’s what nextjs is bugging

[
  {
    _id: '601006079a0c1122f4cea4a6',
    nome: 'Notícias',
    published_at: '2021-01-26T12:42:12.473Z',
    slug: 'noticias',
    createdAt: '2021-01-26T12:07:35.163Z',
    updatedAt: '2021-01-26T12:42:12.536Z',
    __v: 0,
    blogs: [ [Object] ],
    id: '601006079a0c1122f4cea4a6'
  }
]