diff --git a/app/views/courses/show.html.erb b/app/views/courses/show.html.erb
index deb590d1f..d7d579dd1 100644
--- a/app/views/courses/show.html.erb
+++ b/app/views/courses/show.html.erb
@@ -1,4 +1,4 @@
-<% if @events_by_day.size >0 %>
+<% if @events_by_day != nil && @events_by_day.size >0 %>
     <div class="content-title-top-avtive">
       <!-- <h3><%= @author.nil? ? l(:label_activity) : l(:label_user_activity, link_to_user(@author)).html_safe %></h3> -->
       <p class="subtitle">