diff --git a/lib/rss_ntu_job.rb b/lib/rss_ntu_job.rb
index e3a9b48..d612170 100644
--- a/lib/rss_ntu_job.rb
+++ b/lib/rss_ntu_job.rb
@@ -38,6 +38,7 @@ SITES.each_with_index do |(name, url), i|
 
     feed.items.each do |item|
       category = item.category.to_s.gsub(/\<(\/)*category\>/, '')
+      category = "未分類" if category.blank?
       
       if ( item.pubDate > yesterday ) && ( CATEGORIES[i][0] == "全部" || CATEGORIES[i].include?(category) ) 
         recent_feed[item.title.strip] = { date: item.pubDate, description: item.description.gsub("\r\n", '<br/>').strip,