Problem deleting ads

Issue is with the following method in class dfp_tag_ui.class.php

function delete_page($js, $input, $item) {
    $delta = drupal_strlen($item->machinename) >= 32 ? md5($item->machinename) : $item->machinename;
    db_delete('block')
      ->condition('module', 'dfp')
      ->condition('delta', $delta)
      ->execute();

    return parent::delete_page($js, $input, $item);
  }

If the block module is not enabled / uninstalled, there is no way to delete an ad as it will throw a PDO Exception due to there being no block db table. The block module is not listed as a dependency and should not be as there is an option to not display ads as blocks.