Illegal string offset - please help what is this?

[TheLastSuperman]

From the file:

PHP Code:

            case 'pm':
                $userinfo['action'] = $vbphrase['private_messaging'];
                if ($vbulletin->userinfo['permissions']['wolpermissions'] & $vbulletin->bf_ugp_wolpermissions['canwhosonlinefull'])
                {
                    if ($seeuserid)
                    {
                        $userinfo['where'] = '<a href="' . fetch_seo_url('member', array('userid' => $seeuserid, 'username' => $wol_user["$seeuserid"]['username'])) . "\">$username</a>";
                    }
                    if ($userinfo['values']['do'] == 'newpm' OR $userinfo['values']['do'] == 'insertpm' OR $userinfo['values']['do'] == 'newmessage')
                    {
                        $userinfo['action'] = $vbphrase['creating_private_message'];
                    }
                    else if ($userinfo['values']['do'] == 'editfolders' OR $userinfo['action']['do'] == 'updatefolders')
                    {
                        $userinfo['action'] = $vbphrase['modifying_private_message_folders'];
                    }
                    else if ($userinfo['values']['do'] == 'trackpm' OR $userinfo['values']['do'] == 'deletepmreceipt')
                    {
                        $userinfo['action'] = $vbphrase['tracking_private_messages'];
                    }
                    else if ($userinfo['values']['do'] == 'showpm')
                    {
                        $userinfo['action'] = $vbphrase['viewing_private_message'];
                    }
                    else if ($userinfo['values']['do'] == 'downloadpm')
                    {
                        $userinfo['action'] = $vbphrase['downloading_private_messages'];
                    }

                } 


with line 516 being:

PHP Code:

                    else if ($userinfo['values']['do'] == 'editfolders' OR $userinfo['action']['do'] == 'updatefolders') 


The entire snippet starting at 516 to finish is:

PHP Code:

                    else if ($userinfo['values']['do'] == 'editfolders' OR $userinfo['action']['do'] == 'updatefolders')
                    {
                        $userinfo['action'] = $vbphrase['modifying_private_message_folders'];
                    } 


And you said w/ plugins disabled it still persist so can't be a little pm preview plugin or similar causing it must be issue regarding 4.2.2 then.