1 files changed, 5 insertions, 1 deletions
diff --git a/app/models/wiki_page.rb b/app/models/wiki_page.rb
index e99bb314e..19961cb0b 100644
--- a/app/models/wiki_page.rb
+++ b/app/models/wiki_page.rb
@@ -29,6 +29,10 @@ class WikiPage < ActiveRecord::Base
   end
   
   def pretty_title
-    title.tr '_', ' '
+    WikiPage.pretty_title(title)
+  end
+  
+  def self.pretty_title(str)
+    (str && str.is_a?(String)) ? str.tr('_', ' ') : str
   end
 end