The "path" argument must be of type string. Received type boolean (false)

---js
{
  layout: "layouts/default.njk",
  pagination: {
    alias: "spage",
    data: "pages",
    size: 1,
    addAllPagesToCollections: true,
  },
  eleventyComputed: {
    title: (data) => data.spage.title,
    eleventyNavigation: {
      key: (data) => {
        if (data.spage.navigation) {
          return data.spage.navigation.key;
        }

        return null;
      },
      parent: (data) => {
        if (data.spage.navigation && data.spage.navigation.parent) {
          return data.spage.navigation.parent.navigation.key;
        }

        return null;
      }
    },
    permalink: (data) => {
      if (data.spage.slug) {
        return `${data.spage.slug.current}index.html`;
      }
      
      return false;
    }
  }
}
---