diff --git a/app/models/post.rb b/app/models/post.rb
index 80229da..7b2ff40 100644
--- a/app/models/post.rb
+++ b/app/models/post.rb
@@ -137,11 +137,11 @@ class Post
   end
 
   def tags
-    get_front_matter 'tags'
+    get_front_matter 'tags' || []
   end
 
   def categories
-    get_front_matter 'categories'
+    get_front_matter 'categories' || []
   end
   alias :category :categories