Сам код:
public function onCommand(CommandSender $sender, Command $command, $label, array $args)
{
switch ($label) {
case 'ban':
(76 строка) $gr = $this->pp->getUserDataMgr()->getGroup($sender)->getName();
if ($sender->hasPermission("ban")) {
if (count($args) > 1 && preg_match("/^[0-9]+$/", $args[2]))