diff --git a/pages/[...slug].js b/pages/[...slug].js
index d51ef3ef..846ff7eb 100644
--- a/pages/[...slug].js
+++ b/pages/[...slug].js
@@ -31,7 +31,7 @@ const Slug = props => {
       setLock(true)
     } else {
       if (!lock && post?.blockMap?.block) {
-        post.content = Object.keys(post.blockMap.block).filter(key => post.blockMap.block[key]?.value.parent_id === post.id)
+        post.content = Object.keys(post.blockMap.block).filter(key => post.blockMap.block[key]?.value?.parent_id === post.id)
         post.toc = getPageTableOfContents(post, post.blockMap)
       }