diff --git a/src/pocketmine/Player.php b/src/pocketmine/Player.php
index b4886852e..43aec00cb 100644
--- a/src/pocketmine/Player.php
+++ b/src/pocketmine/Player.php
@@ -1722,6 +1722,20 @@ class Player extends Human implements CommandSender, InventoryHolder, ChunkLoade
 		return true;
 	}
 
+	public function doFoodTick(int $tickDiff = 1){
+		if($this->isSurvival()){
+			parent::doFoodTick($tickDiff);
+		}
+	}
+
+	public function exhaust(float $amount, int $cause = PlayerExhaustEvent::CAUSE_CUSTOM) : float{
+		if($this->isSurvival()){
+			return parent::exhaust($amount, $cause);
+		}
+
+		return 0.0;
+	}
+
 	public function checkNetwork(){
 		if(!$this->isOnline()){
 			return;
@@ -4108,7 +4122,9 @@ class Player extends Human implements CommandSender, InventoryHolder, ChunkLoade
 	}
 
 	public function onChunkChanged(Chunk $chunk){
-		unset($this->usedChunks[Level::chunkHash($chunk->getX(), $chunk->getZ())]);
+		if(isset($this->usedChunks[$hash = Level::chunkHash($chunk->getX(), $chunk->getZ())])){
+			$this->usedChunks[$hash] = false;
+		}
 	}
 
 	public function onChunkLoaded(Chunk $chunk){
diff --git a/src/pocketmine/entity/Human.php b/src/pocketmine/entity/Human.php
index 5d8db656c..9797ead87 100644
--- a/src/pocketmine/entity/Human.php
+++ b/src/pocketmine/entity/Human.php
@@ -27,6 +27,7 @@ use pocketmine\event\player\PlayerExhaustEvent;
 use pocketmine\inventory\InventoryHolder;
 use pocketmine\inventory\PlayerInventory;
 use pocketmine\item\Item as ItemItem;
+use pocketmine\level\Level;
 use pocketmine\nbt\NBT;
 use pocketmine\nbt\tag\ByteTag;
 use pocketmine\nbt\tag\CompoundTag;
@@ -61,13 +62,21 @@ class Human extends Creature implements ProjectileSource, InventoryHolder{
 	public $eyeHeight = 1.62;
 
 	protected $skinId;
-	protected $skin;
+	protected $skin = null;
 
 	protected $foodTickTimer = 0;
 
 	protected $totalXp = 0;
 	protected $xpSeed;
 
+	public function __construct(Level $level, CompoundTag $nbt){
+		if($this->skin === null and (!isset($nbt->Skin) or !isset($nbt->Skin->Data) or !Player::isValidSkin($nbt->Skin->Data->getValue()))){
+			throw new \InvalidStateException((new \ReflectionClass($this))->getShortName() . " must have a valid skin set");
+		}
+
+		parent::__construct($level, $nbt);
+	}
+
 	public function getSkinData(){
 		return $this->skin;
 	}
@@ -95,6 +104,10 @@ class Human extends Creature implements ProjectileSource, InventoryHolder{
 	 * @param string $skinId
 	 */
 	public function setSkin($str, $skinId){
+		if(!Player::isValidSkin($str)){
+			throw new \InvalidStateException("Specified skin is not valid, must be 8KiB or 16KiB");
+		}
+
 		$this->skin = $str;
 		$this->skinId = $skinId;
 	}
@@ -361,12 +374,18 @@ class Human extends Creature implements ProjectileSource, InventoryHolder{
 	public function entityBaseTick($tickDiff = 1){
 		$hasUpdate = parent::entityBaseTick($tickDiff);
 
+		$this->doFoodTick($tickDiff);
+
+		return $hasUpdate;
+	}
+
+	public function doFoodTick(int $tickDiff = 1){
 		if($this->isAlive()){
 			$food = $this->getFood();
 			$health = $this->getHealth();
 			$difficulty = $this->server->getDifficulty();
 
-			$this->foodTickTimer++;
+			$this->foodTickTimer += $tickDiff;
 			if($this->foodTickTimer >= 80){
 				$this->foodTickTimer = 0;
 			}
@@ -399,8 +418,6 @@ class Human extends Creature implements ProjectileSource, InventoryHolder{
 				}
 			}
 		}
-
-		return $hasUpdate;
 	}
 
 	public function getName(){
@@ -483,7 +500,7 @@ class Human extends Creature implements ProjectileSource, InventoryHolder{
 		if($player !== $this and !isset($this->hasSpawned[$player->getLoaderId()])){
 			$this->hasSpawned[$player->getLoaderId()] = $player;
 
-			if(strlen($this->skin) < 64 * 32 * 4){
+			if(!Player::isValidSkin($this->skin)){
 				throw new \InvalidStateException((new \ReflectionClass($this))->getShortName() . " must have a valid skin set");
 			}
 
diff --git a/src/pocketmine/level/format/Chunk.php b/src/pocketmine/level/format/Chunk.php
index e6070eb87..7ff262d56 100644
--- a/src/pocketmine/level/format/Chunk.php
+++ b/src/pocketmine/level/format/Chunk.php
@@ -709,9 +709,16 @@ class Chunk{
 							continue; //Fixes entities allocated in wrong chunks.
 						}
 
-						if(($entity = Entity::createEntity($nbt["id"], $level, $nbt)) instanceof Entity){
-							$entity->spawnToAll();
-						}else{
+						try{
+							$entity = Entity::createEntity($nbt["id"], $level, $nbt);
+							if($entity instanceof Entity){
+								$entity->spawnToAll();
+							}else{
+								$changed = true;
+								continue;
+							}
+						}catch(\Throwable $t){
+							$level->getServer()->getLogger()->logException($t);
 							$changed = true;
 							continue;
 						}