--- drupal-6.x-dev-orig/modules/system/system.module	2008-04-09 19:28:56.000000000 -0400
+++ drupal-6.x-dev/modules/system/system.module	2008-06-27 13:34:11.000000000 -0400
@@ -842,7 +842,7 @@ function system_theme_data() {
 function _system_theme_data() {
   static $themes_info = array();
 
-  if (empty($theme_info)) {
+  if (empty($themes_info)) {
     // Find themes
     $themes = drupal_system_listing('\.info$', 'themes');
     // Find theme engines