diff --git a/assets/javascripts/app.js b/assets/javascripts/app.js
index 10510f5..ae46f3a 100644
--- a/assets/javascripts/app.js
+++ b/assets/javascripts/app.js
@@ -765,7 +765,7 @@ function transdate(){
       var _this = $(document.activeElement);//$(this);
       if($('body').css('position') != 'fixed' && !_this.hasClass('close-screen-btn') && !_this.hasClass('navbar-toggle')){
         var ele_offset = _this[0].getBoundingClientRect().top;
-        if(ele_offset.parents('.kenjohn.navFixed').length == 0)
+        if(_this.parents('.kenjohn.navFixed').length == 0)
           ele_offset -= window.top_barrier_height;
         if(ele_offset < 0){
           window.scroll(window.temp_scrollX, window.temp_scrollY + ele_offset);