hook_nodeapi memory error

mcard_nodeapi

/**
 * Implemention of hook_nodeapi().
 */
function mcard_nodeapi(&$node, $op, $a3 = NULL, $a4 = NULL) {

  if ($op == 'view') {

    if ($node->type == 'discount_provider') {

      $bc[] = l('Home', '');
      $bc[] = l('Treasury', 'treasury');
      $bc[] = l('Mcard', 'treasury/mcard');
      $bc[] = l('Discounts' , 'treasury/mcard/discounts');

      drupal_set_breadcrumb($bc);

      drupal_set_title(check_plain(t("Mcard Discounts: @title", array('@title' => $node->title))));

      drupal_add_css(drupal_get_path('module', 'mcard') . '/css/discounts.css');

      $node->content['mcard_discounts_list'] = array(
        '#value' => views_embed_view('mcard_discounts', 'attachment_3', $node->nid),
        '#weight' => 1000,
      );

    }

  }

}