diff --git a/addressfield.module b/addressfield.module
index c010514..774ea1c 100644
--- a/addressfield.module
+++ b/addressfield.module
@@ -255,6 +255,9 @@ function _addressfield_render_address(&$format, $address) {
       elseif (isset($address[$key])) {
         $child['#children'] = check_plain($address[$key]);
       }
+      else {
+        $child['#children'] = '';
+      }
 
       // Skip empty elements.
       if ((string) $child['#children'] === '') {