Call to a member function getTiles() on null

Hi,

my plugin crashes with the following crash dump:

Spoiler

Code:

PocketMine-Soft Crash Dump Sat Jun 27 15:55:48 AWST 2015

Error: Call to a member function getTiles() on null
File: /SuperPE SG/src/SuperPE/Main
Line: 130
Type: E_ERROR

THIS CRASH WAS CAUSED BY A PLUGIN
BAD PLUGIN: SG v1

Code:
[121]  public function getNextSpawn(){
[122]  $this->spawns++;
[123]  $x = $this->prefs->get('spawn_locs')[$this->spawns][0];
[124]  $y = $this->prefs->get('spawn_locs')[$this->spawns][1];
[125]  $z = $this->prefs->get('spawn_locs')[$this->spawns][2];
[126]  return (new Vector3($x, $y, $z));
[127]  }
[128]
[129]  public function refillChests(){
[130]  foreach($this->getServer()->getLevelByName($this->prefs->get("world"))->getTiles() as $t){
[131]  if($t instanceof Chest){
[132]  if($t->isPaired()){
[133]  $inv = $t->getInventory();
[134]  }else{
[135]  $inv = $t->getRealInventory();
[136]  }
[137]  $inv->clearAll();
[138]  foreach($this->prefs->get('chest_items') as $i){
[139]  $inv->addItem(Item::get($i[0], $i[1], $i[2]));
[140]  }

Backtrace:
#0 /src/pocketmine/Server__32bit(0): pocketmine\Server->crashDump()
#1 /SuperPE SG/src/SuperPE/Main(80): SuperPE\Main->refillChests()
#2 /SuperPE SG/src/SuperPE/Main(69): SuperPE\Main->StartGame()
#3 /src/pocketmine/plugin/PluginBase(86): SuperPE\Main->onEnable()
#4 /DevTools_v1.10.0.phar/src/FolderPluginLoader/FolderPluginLoader(125): pocketmine\plugin\PluginBase->setEnabled()
#5 /src/pocketmine/plugin/PluginManager(562): FolderPluginLoader\FolderPluginLoader->enablePlugin()
#6 /src/pocketmine/Server__32bit(2030): pocketmine\plugin\PluginManager->enablePlugin()
#7 /src/pocketmine/Server__32bit(2016): pocketmine\Server->enablePlugin()
#8 /src/pocketmine/Server__32bit(1832): pocketmine\Server->enablePlugins()
#9 /src/pocketmine/PocketMine(458): pocketmine\Server->__construct()
#10 (1): ()
#11 (0): {main}()

PocketMine-MP version: 1.5dev #245 [Protocol 27; API 1.12.0]
Git commit: 0000000000000000000000000000000000000000
uname -a: Windows NT LEGOBOY 6.1 build 7601 (Windows 7 Home Premium Edition Service Pack 1) i586
PHP Version: 5.6.6
Zend version: 2.6.0
OS : WINNT, win

Loaded plugins:
DevTools 1.10.0 by PocketMine Team for API(s) 1.3.1
ManyWorlds 1.3.4 by aliuly for API(s) 1.10.0
SG 1 by SuperPE Network for API(s) 1.12.0

Can anyone help me? I have no idea how to fix it.

A array?

I'll try.

What does $this->prefs->get("world") return?

string I think

I know it returns a string, but what value does it return.

The config is like this:
world: world

And are you sure that functions return "world", and are you sure that world exists? A plugin should always check the correctness of the config file

yes, it exist..

@PEMapModder I can send you full plugin code in PM, but please don't share.

I'll try it. Thank you!

That code looks pretty similar to @luca28pet's SimpleHungerGames

He made it himself... I am sure because I am the bug fixer...

I did it myself.

Well it just looks exactly the same as this: https://github.com/luca28pet/SimpleHungerGames/blob/master/src/SimpleHungerGames/Main.php but if you say so.

Chest refill code is all the same. It may look like I just ripped off but I coded it myself.

Ok