Call to a member function getInventory() on null

So I get this error:
[00:16:07] [Server thread/CRITICAL]: Could not execute task Sean_M\LootCrate\LootCrate: Call to a member function getInventory() on null
[00:16:07] [Server thread/CRITICAL]: Error: "Call to a member function getInventory() on null" (EXCEPTION) in "/plugins/LootCrate-master/src/Sean_M/LootCrate/LootCrate" at line 38

This is my code:

PHP:

<?php

namespace Sean_M\LootCrate;

use pocketmine\block\Block;
use pocketmine\inventory\Inventory;
use pocketmine\level\Level;
use pocketmine\scheduler\PluginTask;
use pocketmine\utils\TextFormat as TF;
use pocketmine\Server;
use pocketmine\event\Listener;
use pocketmine\math\Vector3;

class LootCrate extends PluginTask implements listener {

  ##Rhorerien LEVEL NAME FOR REFERENCE

  ##$this->getOwner()->getServer()

   public $plugin;

      public function __construct(Main $plugin) {
         parent::__construct($plugin);
         $this->plugin = $plugin;
      }

      public function onRun($currentTick) {
         $level = $this->getOwner()->getServer()->getLevelByName("Rhorerien");
          $x = mt_rand(0,255);
          $y = mt_rand(0,255);
          $z = mt_rand(0,255);
          $pos = new Vector3($x, $y, $z);
          $block = Block::get(Block::CHEST);
          $level->setBlock($pos, $block);
          $chest = $level->getTile($pos);
          $slot = mt_rand(0,27);
          foreach($this->getOwner()->getconfig()->get("items") as $item){
          $chest->getInventory()->setItem($slot, $item);
          $cx = $chest->getX();
          $cy = $chest->getY();
          $cz = $chest->getZ();
          $cpos = new Vector3($cx, $cy, $cz);
          if($this->config->get("broadcast.message") == "true"){
            $this->getServer()->broadcastMessage($this->config->get("message", str_replace("{CHEST}", $cpos)));
          }
          }
  }
}

 

There is no chest tile at $pos
You tried to set a chest block, but not a tile. Please check the chest code in PM on how to create a tile

 

Can you show me the code/how?

 

Simply call https://github.com/pmmp/PocketMine-MP/blob/master/src/pocketmine/block/Chest.php#L71 place() with the proper params.