diff --git a/themes/medium/components/TopNavBar.js b/themes/medium/components/TopNavBar.js
index 7dd9433f..4835df81 100644
--- a/themes/medium/components/TopNavBar.js
+++ b/themes/medium/components/TopNavBar.js
@@ -55,7 +55,7 @@ export default function TopNavBar(props) {
             {/* 顶部菜单 */}
             <div className='hidden md:flex'>
                 {navs && navs.map(link => {
-                  if (link.show) {
+                  if (link?.show) {
                     const selected = (router.pathname === link.to) || (router.asPath === link.to)
                     return <Link key={`${link.id}-${link.to}`} title={link.to} href={link.to} >
                             <a target={link.to.indexOf('http') === 0 ? '_blank' : '_self'} className={'px-2 duration-300 text-sm justify-between dark:text-gray-300 cursor-pointer flex flex-nowrap items-center ' +