User warning for author page after upgrade

Hi,

I just updated the Biblio modul to Version 6.x-1.18 using Drupal 6.17 and since than I get the following warning when accessing the authors page:

user warning: Unknown column 'bd.drupal_uid' in 'field list' query: SELECT bd.cid, bd.drupal_uid, bd.name, bd.lastname, bd.firstname, bd.prefix, bd.suffix, bd.initials, bd.affiliation, bd.md5, COUNT(*) AS cnt FROM biblio_contributor b LEFT JOIN biblio_contributor_data bd ON b.cid = bd.cid INNER JOIN node n on n.vid = b.vid WHERE n.status = 1 GROUP BY bd.cid, bd.drupal_uid, bd.name, bd.lastname, bd.firstname, bd.prefix, bd.suffix, bd.initials, bd.affiliation, bd.md5 HAVING COUNT(*) > 0 ORDER BY lastname ASC, SUBSTRING(firstname,1,1) ASC, initials ASC in /var/www/sites/default/modules/biblio/biblio.pages.inc on line 1167.

Also an update to Drupal 6.28 does not resolve the error.