"Argument 3 passed to l() must be an array, string given" on admin content page

The bug is similar to #1367208: Custom pager is broken in Tao-7.x

So, I was able to isolate the problem more closely. The problem is related to the contrib module "Clean Pagination" (http://drupal.org/project/cleanpager). More precisely, this function (cleanpager.module #111):

/**
 * Override theme for a pager link
 */
function cleanpager_theme_pager_link($variables) {
  $text = $variables['text'];
  $page_new = $variables['page_new'];
  $element = $variables['element'];
  $parameters = $variables['parameters'];
  $attributes = $variables['attributes'];

  $page = isset($_GET['page']) ? $_GET['page'] : '';
  if ($new_page = implode(',', pager_load_array($page_new[$element], $element, explode(',', $page)))) {
    $parameters['page'] = $new_page;
  }

  $query = array();
  if (count($parameters)) {
    $query = drupal_get_query_parameters($parameters, array());
  }
  if ($query_pager = pager_get_query_parameters()) {
    $query = array_merge($query, $query_pager);
  }

  // Set each pager link title
  if (!isset($attributes['title'])) {
    static $titles = NULL;
    if (!isset($titles)) {
      $titles = array(
        t('« first') => t('Go to first page'),
        t('‹ previous') => t('Go to previous page'),
        t('next ›') => t('Go to next page'),
        t('last »') => t('Go to last page'),
      );
    }
    if (isset($titles[$text])) {
      $attributes['title'] = $titles[$text];
    }
    elseif (is_numeric($text)) {
      $attributes['title'] = t('Go to page @number', array('@number' => $text));
    }
  }

  return l($text, $_GET['q'], array('attributes' => $attributes, 'query' => $query));
}

Tao uses even the same theme hook, and generates an array instead of a string. However, I do not know who is really responsible for this problem (Tao or Clean Pagination).

Update: Because the theme_pager_link is on several locations implemented (tao's template.php and cleanpager.module), only one function is called. In my case, only the function cleanpager_theme_pager_link() is called. The function tao_theme_pager_link() is not called. And so, not the (later) expected array is returned.