MySQL query

When i created custom action i get this error (always when page was refresh):

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 'N u.fid = f.fid WHERE f.filepath ='sites/default/files/imagecache_sample.png' at line 1 query: SELECT nid, f.fid FROM lagerbille_upload AS u INNER JOIN lagerbille_files AS f N u.fid = f.fid WHERE f.filepath = 'sites/default/files/imagecache_sample.png' LIMIT 1 w pliku /srv/http/quex/www/la-gerbille/sites/default/modules/imagecache_actions/utility.inc, linia 275.

Problem was in this line:

    $sql = "SELECT nid, f.fid FROM {upload} AS u INNER JOIN {files} AS f N u.fid = f.fid WHERE f.filepath = '%s' LIMIT 1";

A small typo, a lack of O in AS fON. Correct line should look like this:

    $sql = "SELECT nid, f.fid FROM {upload} AS u INNER JOIN {files} AS f ON u.fid = f.fid WHERE f.filepath = '%s' LIMIT 1";