Index: modules/search/search.module
===================================================================
RCS file: /cvs/drupal/drupal/modules/search/search.module,v
retrieving revision 1.250.2.6
diff -u -F^function -r1.250.2.6 search.module
--- modules/search/search.module	10 Mar 2009 17:20:01 -0000	1.250.2.6
+++ modules/search/search.module	1 May 2009 18:54:22 -0000
@@ -679,7 +679,7 @@ function search_query_extract($keys, $op
  * e.g. 'type:book'.
  */
 function search_query_insert($keys, $option, $value = '') {
-  if (search_query_extract($keys, $option)) {
+  if (!is_null(search_query_extract($keys, $option))) {
     $keys = trim(preg_replace('/(^| )'. $option .':[^ ]*/i', '', $keys));
   }
   if ($value != '') {