Index: theme.inc
===================================================================
RCS file: /cvs/drupal/drupal/includes/theme.inc,v
retrieving revision 1.415.2.27
diff -u -r1.415.2.27 theme.inc
--- theme.inc	1 Mar 2010 10:02:01 -0000	1.415.2.27
+++ theme.inc	17 Apr 2010 17:57:09 -0000
@@ -1518,6 +1518,7 @@
       $attributes = array();
       $children = array();
       if (is_array($item)) {
+        $data = '';
         foreach ($item as $key => $value) {
           if ($key == 'data') {
             $data = $value;