SQL-DATABASE ERROR

Database error in WoltLab Burning Board (2.3.6): Invalid SQL: SELECT t.*, p.*, i.*, n.id AS newscat_id, n.title AS newscat_title, n.grafikfile, n.position, b.title AS b_title, b.hotthread_reply AS b_hotthread_reply, b.hotthread_view AS b_hotthread_view, b.postsperpage AS b_postsperpage, b.lastposttime AS b_lastposttime FROM bb1_threads t LEFT JOIN bb1_posts p ON (t.threadid=p.threadid && t.starttime=p.posttime) LEFT JOIN bb1_icons i USING (iconid) LEFT JOIN bb1_boards b ON (b.boardid=t.boardid) LEFT JOIN bb1_portal_newscat n ON (t.newscatid=n.id) WHERE t.visible = 1 AND p.visible = 1 AND t.boardid IN (0,113,1,102,3,7,101,18,94,2,42,41,43,54,44,52,104,9,51,19,34,49,47,48,80,105,21,33,31,28,29,30,100,70,26,83,85,86,95,90,89,93,96,97,99,108,109,110,112,116,114) AND t.boardid IN (0) ORDER BY t.starttime DESC LIMIT 0,20
mysql error: Column 'iconid' in from clause is ambiguous
mysql error number: 1052
mysql version: 5.0.51a-24+lenny2
php version: 5.2.6-1+lenny3
Date: 10.09.2010 @ 02:33
Script: /portal_newscat.php
Referer: