Error: Warning: in_array()

[Busterking]

I just don't know how to fix it so that this error doesn't show up on some of my threads:

Warning: in_array() [function.in-array]: Wrong datatype for second argument in /showthread.php(1967) : eval()'d code on line 364

Your help would be greatly appreciated.

Line 364:

// set $perpage

$perpage = sanitize_maxposts($vbulletin->GPC['perpage']);

// ************************************************** ****************************** *
// set post order
if ($vbulletin->userinfo['postorder'] == 0)
{
$postorder = '';
}
else
{
$postorder = 'DESC';
}

// ************************************************** ****************************** *
// get thread info
$thread = verify_id('thread', $threadid, 1, 1);
$threadinfo =& $thread;

($hook = vBulletinHook::fetch_hook('showthread_getinfo')) ? eval($hook) : false;

// ************************************************** ****************************** *
// check for visible / deleted thread
if (((!$thread['visible'] AND !can_moderate($thread['forumid'], 'canmoderateposts'))) OR ($thread['isdeleted'] AND !can_moderate($thread['forumid'])))
{
eval(standard_error(fetch_error('invalidid', $vbphrase['thread'], $vbulletin->options['contactuslink'])));
}

// ************************************************** ****************************** *
// jump page if thread is actually a redirect
if ($thread['open'] == 10)
{
exec_header_redirect('showthread.php?' . $vbulletin->session->vars['sessionurl_js'] . "t=$thread[pollid]");