Index: modules/system/system.module
===================================================================
RCS file: /cvs/drupal/drupal/modules/system/system.module,v
retrieving revision 1.650
diff -u -p -r1.650 system.module
--- modules/system/system.module	28 Nov 2008 09:25:59 -0000	1.650
+++ modules/system/system.module	10 Dec 2008 01:53:50 -0000
@@ -1022,7 +1022,7 @@ function system_get_files_database(&$fil
     if (isset($files[$file->name]) && is_object($files[$file->name])) {
       $file->old_filename = $file->filename;
       foreach ($file as $key => $value) {
-        if (!isset($files[$file->name]) || !isset($files[$file->name]->$key)) {
+        if (!isset($files[$file->name]->$key)) {
           $files[$file->name]->$key = $value;
         }
       }