SQL database error (prolly from plugin)

[PayBas]

Some of my users are experiencing problems, I on the other hand am not :P. But I can't seem to find the cause.

Database error in vBulletin 3.6.5: 

Invalid SQL: 

        SELECT  
            IF(votenum >= 100, votenum, 0) AS votenum, 
            IF(votenum >= 100 AND votenum > 0, votetotal / votenum, 0) AS voteavg, 
         post.pagetext AS preview, 
            thread.threadid, thread.title AS threadtitle, thread.forumid, pollid, open, replycount, postusername, postuserid, thread.iconid AS threadiconid, 
            thread.lastpost, thread.lastposter, thread.lastpostid, thread.dateline, IF(views<=replycount, replycount+1, views) AS views, notes, thread.visible, sticky, votetotal, thread.attach, 
            hiddencount, deletedcount 
            , NOT ISNULL(subscribethread.subscribethreadid) AS issubscribed 
            , deletionlog.userid AS del_userid, deletionlog.username AS del_username, deletionlog.reason AS del_reason 
             
            , threadredirect.expires 
            ,thread_user.usergroupid, thread_user.membergroupids, thread_user.userid 
        FROM php_thread AS thread 
            LEFT JOIN php_deletionlog AS deletionlog ON(thread.threadid = deletionlog.primaryid AND deletionlog.type = 'thread') 
             LEFT JOIN php_subscribethread AS subscribethread ON(subscribethread.threadid = thread.threadid AND subscribethread.userid = 1 AND canview = 1)

I think it's caused by this small plugin but not 100% sure:

PHP Code:

$hook_query_fields .= ',thread_user.usergroupid, thread_user.membergroupids, thread_user.userid'; 
$hook_query_joins .= 'LEFT JOIN user AS thread_user ON(thread.postuserid = thread_user.userid)';