diff --git a/lib/facter/megaraid_virtual_drives.rb b/lib/facter/megaraid_virtual_drives.rb
index f615fcb..a8d0dcd 100644
--- a/lib/facter/megaraid_virtual_drives.rb
+++ b/lib/facter/megaraid_virtual_drives.rb
@@ -29,6 +29,7 @@
       end
     end
 
+    next nil if vds.empty?
     vds.sort.join(',')
   end
 end