Index: modules/search/search.module
===================================================================
RCS file: /cvs/drupal/drupal/modules/search/search.module,v
retrieving revision 1.339
diff -u -r1.339 search.module
--- modules/search/search.module	3 Mar 2010 19:46:25 -0000	1.339
+++ modules/search/search.module	9 Mar 2010 22:47:45 -0000
@@ -911,7 +911,7 @@
   );
   // processed_keys is used to coordinate keyword passing between other forms
   // that hook into the basic search form.
-  $form['basic']['processed_keys'] = array('#type' => 'value', '#value' => array());
+  $form['basic']['processed_keys'] = array('#type' => 'value', '#value' => '');
   $form['basic']['submit'] = array('#type' => 'submit', '#value' => t('Search'));
 
   return $form;