How can I hide suffocation message?

how can I hide suffocation and other cause from sending in chat?

PHP:

public function onDeath(PlayerDeathEvent $event)
    {
        $cause = $event->getEntity()->getLastDamageCause();
        if ($cause instanceof EntityDamageByEntityEvent) {
            $event->setDeathMessage("");
        }
    }
i tried if($cause == EntityDamageEvent::CAUSE_FALL){
$event->setDeathMessage(""); but don't work
}

 

PHP:

public function onDeath(PlayerDeathEvent $e){
if($e->getCause() == 3){
   $e->setDeathMessage('');
}
}

 

doesn't work.

 

Try this

PHP:

public function onPlayerDeath(PlayerDeathEvent $event){
        $player = $event->getPlayer();
        if ($player instanceof Player){
            $cause = $player->getLastDamageCause()->getCause();
            if($cause === EntityDamageEvent::CAUSE_SUFFOCATION){
                $event->setDeathMessage(null);
            }
        }
    }

 

What's NPE?