diff --git a/atom.xml b/atom.xml
index 6ab0c35..98e8718 100644
--- a/atom.xml
+++ b/atom.xml
@@ -7,8 +7,9 @@ layout: none
     <title>peachmoon.moe blog and updates</title>
     <description>site updates and blog posts by mana</description>
     <link>{{ site.url }}</link>
-    
-    {% assign all_posts = site.posts | concat: site.collections.updates.docs %}
+
+    {% assign updates_posts = site.collections.updates.docs | default: [] %}
+    {% assign all_posts = site.posts | concat: updates_posts %}
     {% assign sorted_posts = all_posts | sort: 'date' %}
 
     {% for post in sorted_posts %}