Index: modules/filter/filter.admin.inc
===================================================================
RCS file: /cvs/drupal/drupal/modules/filter/filter.admin.inc,v
retrieving revision 1.64
diff -u -p -r1.64 filter.admin.inc
--- modules/filter/filter.admin.inc	17 Aug 2010 13:50:52 -0000	1.64
+++ modules/filter/filter.admin.inc	1 Sep 2010 18:30:31 -0000
@@ -271,13 +271,11 @@ function theme_filter_admin_format_filte
  * Validate text format form submissions.
  */
 function filter_admin_format_form_validate($form, &$form_state) {
-  if (!isset($form_state['values']['format'])) {
-    $format_name = trim($form_state['values']['name']);
-    form_set_value($form['name'], $format_name, $form_state);
-    $result = db_query("SELECT format FROM {filter_format} WHERE name = :name", array(':name' => $format_name))->fetchField();
-    if ($result) {
-      form_set_error('name', t('Text format names must be unique. A format named %name already exists.', array('%name' => $format_name)));
-    }
+  $format_name = trim($form_state['values']['name']);
+  form_set_value($form['name'], $format_name, $form_state);
+  $result = db_query("SELECT format FROM {filter_format} WHERE name = :name", array(':name' => $format_name))->fetchField();
+  if ($result != $form_state['values']['format']) {
+    form_set_error('name', t('Text format names must be unique. A format named %name already exists.', array('%name' => $format_name)));
   }
 }