[kh99]

Same problem I suppose. Another thing you can do is to check if it's an array, like:

// Find NEW member group IDs (Added Member Groups)
    $addedmembergroupids = array();
    if (is_array($vbulletin->GPC['user']['membergroupids'])
    {
        foreach ($vbulletin->GPC['user']['membergroupids'] AS $newmembergroupid)
        {
            if (!in_array( $newmembergroupid, explode(',', $userinfo['membergroupids']) ) )
            {
                $addedmembergroupids[] = $newmembergroupid;
            }
        }
    }

But you say it was working in vb3.8 so I'm not sure why this stuff would need to be added now.