diff --git a/lib/jekyll/tagging.rb b/lib/jekyll/tagging.rb
index 2637751..a6dc5fa 100644
--- a/lib/jekyll/tagging.rb
+++ b/lib/jekyll/tagging.rb
@@ -137,6 +137,7 @@ def tag_url(tag, type = :page, site = Tagger.site)
 
     def tags(obj)
       tags = obj['tags'].dup
+      return unless tags
       tags.map! { |t| t.first } if tags.first.is_a?(Array)
       tags.map! { |t| tag_link(t, tag_url(t), :rel => 'tag') if t.is_a?(String) }.compact!
       tags.join(', ')