fix

app/helpers/activities_helper.rb

@@ -24,7 +24,7 @@ module ActivitiesHelper
     events.sort {|x, y| y.event_datetime <=> x.event_datetime}.each do |event|
       if group_events = events_by_group.delete(event.event_group)
         group_events.sort {|x, y| y.event_datetime <=> x.event_datetime}.each_with_index do |e, i|
-          sorted_events << [e, i > 0]
+          sorted_events << [e, i > 0] unless e.event_description.nil?
         end
       end
     end