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1. drupal
   1. drupal6
   2. drupal7

Code

modules/block/block.admin.inc, line 266

<?php
function block_admin_configure_validate($form, &$form_state) {
  if ($form_state['values']['module'] == 'block') {
    if (empty($form_state['values']['info']) || db_result(db_query("SELECT COUNT(*) FROM {boxes} WHERE bid != %d AND info = '%s'", $form_state['values']['delta'], $form_state['values']['info']))) {
      form_set_error('info', t('Please ensure that each block description is unique.'));
    }
  }
}
?>