On player quit, delete inventory

How to delete the player inventory quen left the game??

i tried whit:

but i get this error: Error: Call to a member function setContents() on null

when*

But why would you want to delete someones inventory when they leave

too tried with
$event->getPlayer()->getInventory()->setContents(array(Item::get(0, 0, 0)));
but get the same error xd

tht didnt answer my question

setContents() is not on the code you show.
I cannot deem the problem based on unseen code

He said he tried with that too.

Public function onQuit(PlayerQuitEvent $event)

$event->getPlayer ()->getInventory ()->clearAll ();
} <- This
}

I'm not that good at coding... how do you implement this?

try this =_=

PHP:

public function OnJoin(PlayerJoinEvent $event){
$player->$event->getPlayer();
$inv = $player->getInventory();
if ($inv instanceof PlayerInventory) {
$inv->clearAll();
}
}


Just remove invetory when player join

Make sure your implementing the Listener

PHP:

<?php

use pocketmine\plugin\PluginBase;
use pockemine\event\Listener;
use pocketmine\event\player\PlayerQuitEvent;

namespace Plugin;

class Main extends PluginBase implements Listener {
    public function onQuit(PlayerQuitEvent $event) {
        $event->getPlayer()->getInventory()->clearAll();
    }
}


EDIT***

PHP:

<?php

use pocketmine\plugin\PluginBase;
use pockemine\event\Listener;
use pocketmine\event\player\PlayerQuitEvent;

namespace Plugin;

class Main extends PluginBase implements Listener {

    public function onEnable() {
        $this->getServer()->getPluginManager()->registerEvents($this, $this);
    }

    public function onQuit(PlayerQuitEvent $event) {
        $event->getPlayer()->getInventory()->clearAll();
    }
}


RegisterEvents

i get this on crashdump

OMG -,-

clearAll() likes to crash the server if the players inventory is already empty, use this instead:

PHP:

<?php
use pocketmine\plugin\PluginBase;
use pockemine\event\Listener;
use pocketmine\event\player\PlayerQuitEvent;
use pocketmine\item\Item;

namespace Plugin;

class Main extends PluginBase implements Listener {

    public function onEnable() {
    $this->getServer()->getPluginManager()->registerEvents($this, $this);
    }

    public function onQuit(PlayerQuitEvent $event) {
    $event->getPlayer()->getInventory()->setContents(array(Item::get(0, 0, 0));
    }
}


Yes i have same problem

Logs the same error

It can't have the same error... the clearAll() function was taken out.

Guys, did you even read the error message?
It seems that the player inventory isn't even initialized. That happens when the player quits before logging in.
Do a check first:
if($player->getInventory() instanceof PlayerInventory)