Issue #1335482 by jasperknops: Fixed No check if delta is unique.

  public function save() {

    // Set the delta if it's not set already

    if (empty($this->delta)) {

      $max_length = 32;

      // Base it on the label and make sure it isn't too long for the database

      $this->delta = drupal_clean_css_identifier(strtolower($this->label));

      $this->delta = substr($this->delta, 0, 32);

      $this->delta = substr($this->delta, 0, $max_length);

      // Check if delta is unique

      if (bean_load_delta($this->delta)) {

        $i = 0;

        $separator = '-';

        $original_delta = $this->delta;

        do {

          $unique_suffix = $separator . $i++;

          $this->delta = substr($original_delta, 0, $max_length - drupal_strlen($unique_suffix)) . $unique_suffix;

        } while (bean_load_delta($this->delta));

      }

    }

    $return = parent::save();

    block_flush_caches();

    return $return;