diff --git a/src/pages/tags/[tag]/[...page].astro b/src/pages/tags/[tag]/[...page].astro
index 488d35d..fa41264 100644
--- a/src/pages/tags/[tag]/[...page].astro
+++ b/src/pages/tags/[tag]/[...page].astro
@@ -17,7 +17,7 @@ export const getStaticPaths: GetStaticPaths = async ({ paginate }) => {
 
   return uniqueTags.flatMap((tag) => {
     const filterPosts = allPostsByDate.filter((post) =>
-      post.tags.includes(tag),
+      post.tags?.includes(tag),
     );
     return paginate(filterPosts, {
       pageSize: 10,