diff --git a/themes/heo/components/Catalog.js b/themes/heo/components/Catalog.js
index 1ec3dabb..c94622aa 100644
--- a/themes/heo/components/Catalog.js
+++ b/themes/heo/components/Catalog.js
@@ -63,14 +63,14 @@ const Catalog = ({ toc }) => {
     <div className='w-full'><i className='mr-1 fas fa-stream' />{locale.COMMON.TABLE_OF_CONTENTS}</div>
     <div className='overflow-y-auto max-h-36 lg:max-h-96 overscroll-none scroll-hidden' ref={tRef}>
       <nav className='h-full'>
-        {toc.map((tocItem) => {
+        {toc?.map((tocItem) => {
           const id = uuidToId(tocItem.id)
           tocIds.push(id)
           return (
             <a
               key={id}
               href={`#${id}`}
-              className={`notion-table-of-contents-item duration-300 transform font-light dark:text-gray-200
+              className={`notion-table-of-contents-item duration-300 transform dark:text-gray-200
             notion-table-of-contents-item-indent-level-${tocItem.indentLevel} `}
             >
               <span style={{ display: 'inline-block', marginLeft: tocItem.indentLevel * 16 }}