diff --git a/atom.xml b/atom.xml
index 73c19ec..b3f43ad 100644
--- a/atom.xml
+++ b/atom.xml
@@ -4,7 +4,7 @@
   {% if config.subtitle %}<subtitle>{{ config.subtitle | e }}</subtitle>{% endif %}
   <link href="{{ feed_url | uriencode }}" rel="self"/>
   <link href="{{ url | uriencode }}"/>
-  <updated>{{ posts.first().updated.toISOString() }}</updated>
+  <updated>{{ posts.data.length > 0 ? posts.first().updated.toISOString() : '' }}</updated>
   <id>{{ url }}</id>
   {% if config.author %}
   <author>
diff --git a/rss2.xml b/rss2.xml
index 9698c5f..dc14c8f 100644
--- a/rss2.xml
+++ b/rss2.xml
@@ -7,7 +7,7 @@
     <link>{{ url | uriencode }}</link>
     <atom:link href="{{ feed_url | uriencode }}" rel="self" type="application/rss+xml"/>
     <description>{{ config.description | e }}</description>
-    <pubDate>{{ posts.first().updated.toDate().toUTCString() }}</pubDate>
+    <pubDate>{{ posts.data.length > 0 ? posts.first().updated.toDate().toUTCString() : '' }}</pubDate>
     <generator>http://hexo.io/</generator>
     {% for post in posts.toArray() %}
     <item>