مشكلة في [ جديد المواضيع ]

[FONT=Arial][SIZE=3]Database error in vBulletin 3.8.2:

Invalid SQL:

            SELECT post.pagetext AS preview,
                thread.threadid, thread.threadid AS postid, thread.title AS threadtitle, thread.iconid AS threadiconid, thread.dateline, thread.forumid,
                thread.sticky, thread.prefixid, thread.taglist, thread.pollid, thread.open, thread.lastpost AS postdateline, thread.visible,
                thread.hiddencount, thread.deletedcount, thread.attach, thread.postusername, thread.forumid,
                
                replycount, IF(views<=replycount, replycount+1, views) AS views,
                thread.lastpost, thread.lastposter, thread.lastpostid
            ,
                deletionlog.userid AS del_userid, deletionlog.username AS del_username, deletionlog.reason AS del_reason,
                user.userid AS postuserid
                , NOT ISNULL(subscribethread.subscribethreadid) AS issubscribed
                
                , attachment.thumbnail_filesize AS thumbsize , MIN(attachment.attachmentid) AS attachmentid , attachment.thumbnail_filesize AS thumbsize , MIN(attachment.attachmentid) AS attachmentid , post.pagetext AS previewbbcode
            FROM thread AS thread
            LEFT JOIN user AS user ON(user.userid = thread.postuserid)

            LEFT JOIN deletionlog AS deletionlog ON(thread.threadid = deletionlog.primaryid AND deletionlog.type = 'thread')
            
             LEFT JOIN subscribethread AS subscribethread
                ON(subscribethread.threadid = thread.threadid AND subscribethread.userid = 274 AND canview = 1)
            LEFT JOIN post AS post ON(post.postid = thread.firstpostid)
            
            LEFT JOIN attachment as attachment ON(attachment.postid = thread.firstpostid AND (attachment.extension = 'jpg' OR attachment.extension = 'gif' OR attachment.extension = 'png')) LEFT JOIN attachment as attachment ON(attachment.postid = thread.firstpostid AND (attachment.extension = 'jpg' OR attachment.extension = 'gif' OR attachment.extension = 'png')) 
            WHERE thread.threadid IN
        (9907, 7628, 6481, 9889, 3306, 9909, 353, 9913, 9371, 9911, 9914);

MySQL Error   : Not unique table/alias: 'attachment'
Error Number  : 1066[/SIZE][/FONT]