PocketMine-MP Crash Dump Sun Mar 26 10:57:55 EDT 2017

Error: Call to a member function setMaxValue() on null
File: /src/pocketmine/entity/Living
Line: 81
Type: notice

Code:
[72] 		if($this->isAlive() and !$wasAlive){
[73] 			$pk = new EntityEventPacket();
[74] 			$pk->eid = $this->getId();
[75] 			$pk->event = EntityEventPacket::RESPAWN;
[76] 			$this->server->broadcastPacket($this->hasSpawned, $pk);
[77] 		}
[78] 	}
[79]
[80] 	public function setMaxHealth($amount){
[81] 		$this->attributeMap->getAttribute(Attribute::HEALTH)->setMaxValue($amount);
[82] 	}
[83]
[84] 	public function saveNBT(){
[85] 		parent::saveNBT();
[86] 		$this->namedtag->Health = new ShortTag("Health", $this->getHealth());
[87] 	}
[88]
[89] 	public abstract function getName();
[90]
[91] 	public function hasLineOfSight(Entity $entity){

Backtrace:
#0 /plugins/CosmicCore-master/src/CosmicCore/Cosmic/Mobs/Zombie(28): pocketmine\entity\Living->setMaxHealth(integer 20)
#1 /src/pocketmine/entity/Entity(345): CosmicCore\Cosmic\Mobs\Zombie->initEntity(boolean)
#2 /src/pocketmine/entity/Entity(535): pocketmine\entity\Entity->__construct(pocketmine\level\Level object, pocketmine\nbt\tag\CompoundTag pocketmine\nbt\tag\CompoundTag{.pocketmine\nbt\tag\ListTag:pocketmine\nbt\tag\ListTag{.pocketmine\nbt\tag\DoubleTag:0.32140092939204.pocketmine\nbt\tag\DoubleTag:69.pocketmine\nbt\tag\DoubleTag:-75.100507771643.}.pocketmine\nbt\tag\ListTag:pocketmine\nbt\tag\ListTag{.pocketmine\nbt\tag\DoubleTag:0.pocketmine\nbt\tag\DoubleTag:0.pocketmine\nbt\tag\DoubleTag:0.}.pocketmine\nbt\tag\ListTag:pocketmine\nbt\tag\ListTag{.pocketmine\nbt\tag\FloatTag:304.49954223633.pocketmine\nbt\tag\FloatTag:0.}.pocketmine\nbt\tag\FloatTag:0.pocketmine\nbt\tag\ShortTag:0.pocketmine\nbt\tag\ShortTag:400.pocketmine\nbt\tag\ByteTag:0.pocketmine\nbt\tag\ByteTag:0.pocketmine\nbt\tag\StringTag:Zombie.pocketmine\nbt\tag\ShortTag:20.})
#3 /src/pocketmine/level/format/Chunk(694): pocketmine\entity\Entity::createEntity(string Zombie, pocketmine\level\Level object, pocketmine\nbt\tag\CompoundTag pocketmine\nbt\tag\CompoundTag{.pocketmine\nbt\tag\ListTag:pocketmine\nbt\tag\ListTag{.pocketmine\nbt\tag\DoubleTag:0.32140092939204.pocketmine\nbt\tag\DoubleTag:69.pocketmine\nbt\tag\DoubleTag:-75.100507771643.}.pocketmine\nbt\tag\ListTag:pocketmine\nbt\tag\ListTag{.pocketmine\nbt\tag\DoubleTag:0.pocketmine\nbt\tag\DoubleTag:0.pocketmine\nbt\tag\DoubleTag:0.}.pocketmine\nbt\tag\ListTag:pocketmine\nbt\tag\ListTag{.pocketmine\nbt\tag\FloatTag:304.49954223633.pocketmine\nbt\tag\FloatTag:0.}.pocketmine\nbt\tag\FloatTag:0.pocketmine\nbt\tag\ShortTag:0.pocketmine\nbt\tag\ShortTag:400.pocketmine\nbt\tag\ByteTag:0.pocketmine\nbt\tag\ByteTag:0.pocketmine\nbt\tag\StringTag:Zombie.pocketmine\nbt\tag\ShortTag:20.})
#4 /src/pocketmine/level/Level(2476): pocketmine\level\format\Chunk->initChunk(pocketmine\level\Level object)
#5 /src/pocketmine/level/Level(2153): pocketmine\level\Level->loadChunk(integer 0, integer -5, boolean 1)
#6 /src/pocketmine/level/Level(2722): pocketmine\level\Level->getChunk(integer 0, integer -5, boolean 1)
#7 /src/pocketmine/Player(775): pocketmine\level\Level->populateChunk(integer 0, integer -5)
#8 /src/pocketmine/Player(1624): pocketmine\Player->sendNextChunk(boolean)
#9 /src/pocketmine/Server(2366): pocketmine\Player->checkNetwork(boolean)
#10 /src/pocketmine/Server(2125): pocketmine\Server->tick(boolean)
#11 /src/pocketmine/Server(2008): pocketmine\Server->tickProcessor(boolean)
#12 /src/pocketmine/Server(1629): pocketmine\Server->start(boolean)
#13 /src/pocketmine/PocketMine(492): pocketmine\Server->__construct(BaseClassLoader object, pocketmine\utils\MainLogger object, string /root/pmmp/, string /root/pmmp/, string /root/pmmp/plugins/)

PocketMine-MP version: 1.6.2dev #0 [Protocol 102; API 2.0.0]
Git commit: 0000000000000000000000000000000000000000
uname -a: Linux cosmicpe 4.4.30-mod-std-ipv6-64 #9 SMP Tue Nov 1 17:58:26 CET 2016 x86_64
PHP Version: 7.0.17
Zend version: 3.0.0
OS : Linux, linux

Loaded plugins:
FolderPluginLoader 1.1.0 by  for API(s) 2.0.0
CosmicCore 2 by Muqsit for API(s) 2.0.0
PurePerms X by  for API(s) 1.13.1, 2.0.0
EssentialsPE 1.1.3 by  for API(s) 2.0.0
DevTools 1.1-iTX by PocketMine Team & iTX Technologies LLC for API(s) 1.12.0, 2.0.0
EconomyAPI 2.0.9 by onebone for API(s) 1.13.1, 2.0.0
Test 1 by  for API(s) 2.0.0, 3.0.0, 3.0.0-ALPHA4
HereAuth 1.0-Dev#229 by PEMapModder for API(s) 2.0.0, 3.0.0
EconomySell 2.0.5 by onebone for API(s) 2.0.0
EconomyShop 2.0.3 by onebone for API(s) 2.0.0
FactionsPro 1 by  for API(s) 2.0.0, 3.0.0, 3.0.0-ALPHA4
PureChat 1.3.3 by 64FF00 for API(s) 2.0.0

----------------------REPORT THE DATA BELOW THIS LINE-----------------------

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===END CRASH DUMP===