diff --git a/assets/javascripts/app.js b/assets/javascripts/app.js
index 4a52dd9..f6cddf9 100644
--- a/assets/javascripts/app.js
+++ b/assets/javascripts/app.js
@@ -11,7 +11,7 @@
       var scrollTop = $(window).scrollTop();
       var scrollBottom = $('html').height() - $(window).height() - $('.kenjohn').height();
       if (scrollTop>5 && scrollBottom>0)  {          /* 要滑動到選單的距離 */
-        if (parseInt($('.layout-content').css('margin-top'))==0 && $('.layout-content.topcontent').offset().top<400){
+        if (parseInt($('.layout-content').css('margin-top'))==0 && $('.layout-content.topcontent').length != 0 && $('.layout-content.topcontent').offset().top<400){
           $('.layout-content').css('margin-top',$('.kenjohn').height()-$('#orbit-bar').height());
         }
         $('.kenjohn').addClass('navFixed').removeClass('navRel');   /* 幫選單加上固定效果 */
@@ -832,7 +832,7 @@ function transdate(){
           var theTop;
           if (stop){
             $(".kenjohn").addClass('navFixed');
-            if ($('.layout-content.topcontent').offset().top<400){
+            if ($('.layout-content.topcontent').length != 0 && $('.layout-content.topcontent').offset().top<400){
               $('.layout-content').css('margin-top',$('.kenjohn').height()-$('#orbit-bar').height());
             }
             if (parseInt($('.layout-content').css('margin-top')==0)){