diff --git a/field_slideshow.module b/field_slideshow.module
index a215eb7..814ce73 100644
--- a/field_slideshow.module
+++ b/field_slideshow.module
@@ -524,8 +524,10 @@ function field_slideshow_theme() {
  */
 function theme_field_slideshow($variables) {
   // Change order if needed
-  if ($variables['order'] == 'reverse') $variables['items'] = array_reverse($variables['items']);
-  elseif ($variables['order'] == 'random') shuffle($variables['items']);
+  if (isset($variables['order'])) {
+    if ($variables['order'] == 'reverse') $variables['items'] = array_reverse($variables['items']);
+    elseif ($variables['order'] == 'random') shuffle($variables['items']);
+  }
 
   // Generate slides
   $field_slideshow_zebra = 'odd';
@@ -544,7 +546,7 @@ function theme_field_slideshow($variables) {
     $image['path'] = $item['uri'];
     $image['alt'] = isset($item['alt']) ? $item['alt'] : '';
     if (isset($item['title']) && drupal_strlen($item['title']) > 0) $image['title'] = $item['title'];
-    if ($variables['image_style']) {
+    if (isset($variables['image_style'])) {
       $image['style_name'] = $variables['image_style'];
       $image_output = theme('image_style', $image);
     }