line 52
$signups = db_query("SELECT u.name, u.mail, s_l.sid, s_l.anon_mail, s_l.form_data, s_l.signup_time FROM {signup_log} s_l INNER JOIN {users} u ON u.uid = s_l.uid WHERE s_l.nid = %d", $node->nid);

should be change to
$signups = db_query("SELECT u.name, u.mail, s_l.sid, s_l.anon_mail, s_l.signup_time, s_l.form_data FROM {signup_log} s_l INNER JOIN {users} u ON u.uid = s_l.uid WHERE s_l.nid = %d", $node->nid);

Files: 
CommentFileSizeAuthor
signup.patch1.05 KBxenyo