diff --git a/assets/javascripts/app.js b/assets/javascripts/app.js
index ab1611e..7882dfc 100644
--- a/assets/javascripts/app.js
+++ b/assets/javascripts/app.js
@@ -372,7 +372,7 @@
   // 當文件物件模型(DOM)載入後，執行init函數
   $(document).ready(function() {
     init();
-    if( $('div[data-pp="1000"]').html().trim() !== ''){
+    if( $('div[data-pp="1000"]').length != 0 && $('div[data-pp="1000"]').html().trim() !== ''){
       $('.black-screen').addClass('active');
     }
     $('.close-btn').click(function() {