diff --git a/app/controllers/forum_topics_controller.rb b/app/controllers/forum_topics_controller.rb
index 96a13dbe6..1fbf4e9e6 100644
--- a/app/controllers/forum_topics_controller.rb
+++ b/app/controllers/forum_topics_controller.rb
@@ -33,7 +33,9 @@ class ForumTopicsController < ApplicationController
     @forum_posts = ForumPost.search(:topic_id => @forum_topic.id).order("forum_posts.id").paginate(params[:page])
     @forum_posts.all
     respond_with(@forum_topic)
-    session[:read_forum_topics] = @forum_topic.mark_as_read(read_forum_topic_ids)
+    unless CurrentUser.user.is_anonymous?
+      session[:read_forum_topics] = @forum_topic.mark_as_read(read_forum_topic_ids)
+    end
   end
 
   def create