diff --git a/blogchain/src/app/post/[id]/page.tsx b/blogchain/src/app/post/[id]/page.tsx
index 905a637..c7c20fa 100644
--- a/blogchain/src/app/post/[id]/page.tsx
+++ b/blogchain/src/app/post/[id]/page.tsx
@@ -44,8 +44,8 @@ export default function PostDetail() {
           className="flex gap-2 items-center text-xs"
         >
           <div>
-            {post.nft_contract_id.length > 48
-              ? `${post.nft_contract_id.substring(0, 48)}...`
+            {post.nft_contract_id?.length > 48
+              ? `${post.nft_contract_id?.substring(0, 48)}...`
               : post.nft_contract_id}
           </div>
         </Link>
diff --git a/blogchain/src/components/post-card.tsx b/blogchain/src/components/post-card.tsx
index 175aef7..2becbc9 100644
--- a/blogchain/src/components/post-card.tsx
+++ b/blogchain/src/components/post-card.tsx
@@ -31,11 +31,11 @@ const PostCard = ({
       <div className="p-5">
         <Badge>{postDate}</Badge>
         <h5 className="mb-2 text-2xl font-bold tracking-tight text-gray-900 dark:text-white">
-          {title.length > 30 ? `${title.substring(0, 30)}...` : title}
+          {title?.length > 30 ? `${title.substring(0, 30)}...` : title}
         </h5>
         <p className="mb-3 font-normal text-gray-700 dark:text-gray-400 break-all">
           <ReactMarkdown>
-            {description.length > 100
+            {description?.length > 100
               ? `${description.substring(0, 100)}...`
               : description}
           </ReactMarkdown>