diff --git a/app/views/admin/hps_learnings/show.html.erb b/app/views/admin/hps_learnings/show.html.erb
index 4d930e8..9366156 100644
--- a/app/views/admin/hps_learnings/show.html.erb
+++ b/app/views/admin/hps_learnings/show.html.erb
@@ -9,10 +9,10 @@
   <tbody>
   	<% @hpsclass.hps_lectures.each do |lecture| %>
   		 <tr>
-        <% if !lecture.lecture_pic.url.empty? %>
+        <% if !lecture.lecture_pic.nil? && !lecture.lecture_pic.url.empty? %>
           <td><img width="150px" src="<%= lecture.lecture_pic.thumb.url %>" /></td>
         <% else %>
-          <td>&nbsp;</td>
+          <td><img src="http://www.placehold.it/150x150/EFEFEF/AAAAAA" width="150px"></td>
         <% end %>
         <td>
           <%= lecture.subject %>