diff --git a/src/pages/blog/[...slug].astro b/src/pages/blog/[...slug].astro
index 5271ade..6c4ec0c 100644
--- a/src/pages/blog/[...slug].astro
+++ b/src/pages/blog/[...slug].astro
@@ -26,7 +26,7 @@ const slug = Astro.params.slug;
 const author = Array.isArray(entry.data.author) ? entry.data.author : (entry.data.author !== undefined ? [entry.data.author] : [{collection: 'authors', id: siteConfig.defaultAuthor.id}]);
 
 // Get author data
-const authorData = await Promise.all((author).map((singleAuthor) => getEntry(singleAuthor).then(authorEntry => authorEntry.data)))
+const authorData = await Promise.all((author).map((singleAuthor) => getEntry(singleAuthor).then(authorEntry => authorEntry?.data)))
 const authorInfo =  authorData.includes(undefined) ? [{data: siteConfig.defaultAuthor}] : authorData;
 
 // get featured image and use it as og:image