diff --git a/theme/theme.inc b/theme/theme.inc
index 517a25f..eb7c97a 100644
--- a/theme/theme.inc
+++ b/theme/theme.inc
@@ -132,6 +132,9 @@ function template_preprocess_content_display_overview_form(&$vars) {
         $row->{$child} = drupal_render($element[$child]);
       }
       else {
+        if (empty($row->{$child})) {
+          $row->{$child} = new stdClass();
+        }
         $row->{$child}->format = drupal_render($element[$child]['format']);
         $row->{$child}->exclude = drupal_render($element[$child]['exclude']);
       }