diff --git a/layout/includes/third-party/comments/twikoo.pug b/layout/includes/third-party/comments/twikoo.pug
index 8a164d5..5a18d17 100644
--- a/layout/includes/third-party/comments/twikoo.pug
+++ b/layout/includes/third-party/comments/twikoo.pug
@@ -40,4 +40,4 @@ script.
         loadTwikoo()
       }
     }
-  })()
+  })()
\ No newline at end of file
diff --git a/package.json b/package.json
index 4f6dbbd..c098097 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "hexo-theme-butterfly",
-  "version": "3.4.0-b3",
+  "version": "3.4.0-b4",
   "description": "A Simple and Card UI Design theme for Hexo",
   "main": "package.json",
   "scripts": {
diff --git a/source/js/main.js b/source/js/main.js
index 8886e87..6f08db4 100644
--- a/source/js/main.js
+++ b/source/js/main.js
@@ -71,7 +71,8 @@ document.addEventListener('DOMContentLoaded', function () {
  * 首頁top_img底下的箭頭
  */
   const scrollDownInIndex = () => {
-    document.getElementById('scroll-down').addEventListener('click', function () {
+    const $scrollDownEle = document.getElementById('scroll-down')
+    $scrollDownEle && $scrollDownEle.addEventListener('click', function () {
       btf.scrollToDest(document.getElementById('content-inner').offsetTop, 300)
     })
   }