DB Error: syntax error<pre>Articles->getPartnerArchive :SELECT  art_id, art_filename, art_type, art_orig, max(ari_pubdate) pubdate
                 FROM  article, artinstance
                 WHERE (art_id=ari_article)
                 AND (ari_contributormag=)
                 
                 GROUP BY art_id
                 ORDER BY art_type ASC, pubdate DESC
                  [nativecode=1064 ** You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ')
                 
                 GROUP BY art_id
                 ORDER BY a' at line 4]</pre>