diff --git a/themes/media_youtube.theme.inc b/themes/media_youtube.theme.inc
index b7829f4..2913061 100644
--- a/themes/media_youtube.theme.inc
+++ b/themes/media_youtube.theme.inc
@@ -127,7 +127,7 @@ function template_preprocess_media_youtube_flash(&$variables) {
     $tn_options = array(
       'width' => $width,
       'height' => $height,
-      'absolute' => $variables['absolute'],
+      'absolute' => isset($variables['absolute']) ? $variables['absolute'] : FALSE,
       'link_url' => $variables['thumbnail_link_url'],
     );