diff --git a/themes/fukasawa/components/Logo.js b/themes/fukasawa/components/Logo.js
index 14633529..42cbc268 100644
--- a/themes/fukasawa/components/Logo.js
+++ b/themes/fukasawa/components/Logo.js
@@ -4,7 +4,7 @@ const Logo = props => {
   const { siteInfo } = props
   return <section className='flex'>
    <Link href='/'>
-    <a className='hover:bg-black hover:text-white border-black border-2 duration-500 px-4 py-2 cursor-pointer dark:text-gray-300 dark:border-gray-300 font-black'>{siteInfo.title}</a>
+    <a className='hover:bg-black hover:text-white border-black border-2 duration-500 px-4 py-2 cursor-pointer dark:text-gray-300 dark:border-gray-300 font-black'>{siteInfo?.title}</a>
    </Link>
   </section>
 }
diff --git a/themes/hexo/components/Logo.js b/themes/hexo/components/Logo.js
index 4a4f450b..8844d1ad 100644
--- a/themes/hexo/components/Logo.js
+++ b/themes/hexo/components/Logo.js
@@ -5,7 +5,7 @@ const Logo = props => {
   const { siteInfo } = props
   return <Link href='/' passHref>
         <div className='flex flex-col justify-center items-center cursor-pointer space-y-3'>
-          <div className='font-sans text-lg p-1.5 rounded bg-black text-white dark:border-white border-black border'> {siteInfo.title}</div>
+          <div className='font-sans text-lg p-1.5 rounded bg-black text-white dark:border-white border-black border'> {siteInfo?.title}</div>
         </div>
   </Link>
 }
diff --git a/themes/medium/components/LogoBar.js b/themes/medium/components/LogoBar.js
index 6ff2926c..157e01dd 100644
--- a/themes/medium/components/LogoBar.js
+++ b/themes/medium/components/LogoBar.js
@@ -4,7 +4,7 @@ export default function LogoBar (props) {
   const { siteInfo } = props
   return <div id='top-wrapper' className='w-full flex items-center font-sans'>
         <Link href='/'>
-          <a className='text-md md:text-xl dark:text-gray-200'>{siteInfo.title}</a>
+          <a className='text-md md:text-xl dark:text-gray-200'>{siteInfo?.title}</a>
         </Link>
   </div>
 }