Fixed topcis#show

app/views/topics/show.html.erb

@@ -12,13 +12,14 @@
   <div>
     <table>
       <% @topic.posts.each do |post| %>
+        <% if !post.user.blank? %>
           <tr>
             <td class="post_author" rowspan="2">
               <span class="name"><%= post.user.username %></span>
               <span class="avatar"><%= image_tag post.user.gravatar_url %></span>
               <span class="info smaller">
                 <p><strong><%= "Administrator" if post.user.admin? %></strong></p>
-            Posts <%= post.user.posts.size %><br />
+                Posts <%= post.user.posts_count %><br />
                 Registered <%=l post.user.created_at %><br />
               </span>
             </td>
@@ -38,6 +39,7 @@
             </td>
           </tr>
         <%end%>
+      <% end %>
     </table>
   </div>
 </div>