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 (0,2,3,46,8,20,9,65,52,56,64,50,74,11,12,53,13,14,70,76,16,17,54,18,19,71,77,21,22,57,23,24,72,78,26,27,55,28,29,73,79,31,32,33,66,36,38,42,34,40,44,48,43,75,80,63,62,60,59,68,69,82,83,85,89,86,84,88,45,87,90) 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: 5.0.77
php version: 5.2.17
Date: 06.02.2012 @ 18:33
Script: /Forum/portal_newscat.php
Referer: