diff --git a/composer.lock b/composer.lock
index 842e19aa9..afd6b5d1f 100644
--- a/composer.lock
+++ b/composer.lock
@@ -233,16 +233,16 @@
         },
         {
             "name": "pocketmine/binaryutils",
-            "version": "0.1.2",
+            "version": "0.1.3",
             "source": {
                 "type": "git",
                 "url": "https://github.com/pmmp/BinaryUtils.git",
-                "reference": "2c1628f08a9cdeca4d3c682e13f24420944ca845"
+                "reference": "925001c8eff97a36519b16bbd095964b0fc52772"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/pmmp/BinaryUtils/zipball/2c1628f08a9cdeca4d3c682e13f24420944ca845",
-                "reference": "2c1628f08a9cdeca4d3c682e13f24420944ca845",
+                "url": "https://api.github.com/repos/pmmp/BinaryUtils/zipball/925001c8eff97a36519b16bbd095964b0fc52772",
+                "reference": "925001c8eff97a36519b16bbd095964b0fc52772",
                 "shasum": ""
             },
             "require": {
@@ -260,10 +260,10 @@
             ],
             "description": "Classes and methods for conveniently handling binary data",
             "support": {
-                "source": "https://github.com/pmmp/BinaryUtils/tree/0.1.2",
+                "source": "https://github.com/pmmp/BinaryUtils/tree/0.1.3",
                 "issues": "https://github.com/pmmp/BinaryUtils/issues"
             },
-            "time": "2018-12-22T12:29:30+00:00"
+            "time": "2018-12-30T12:17:51+00:00"
         },
         {
             "name": "pocketmine/math",
diff --git a/src/pocketmine/Player.php b/src/pocketmine/Player.php
index e6ebff89f..3a1c24459 100644
--- a/src/pocketmine/Player.php
+++ b/src/pocketmine/Player.php
@@ -3346,9 +3346,7 @@ class Player extends Human implements CommandSender, ChunkLoader, IPlayer{
 	public function onChunkChanged(Chunk $chunk){
 		if(isset($this->usedChunks[$hash = Level::chunkHash($chunk->getX(), $chunk->getZ())])){
 			$this->usedChunks[$hash] = false;
-			if(!$this->spawned){
-				$this->nextChunkOrderRun = 0;
-			}
+			$this->nextChunkOrderRun = 0;
 		}
 	}
 
diff --git a/src/pocketmine/entity/Attribute.php b/src/pocketmine/entity/Attribute.php
index 0ff236fbe..7da662b0d 100644
--- a/src/pocketmine/entity/Attribute.php
+++ b/src/pocketmine/entity/Attribute.php
@@ -110,8 +110,8 @@ class Attribute{
 	}
 
 	public function setMinValue(float $minValue){
-		if($minValue > $this->getMaxValue()){
-			throw new \InvalidArgumentException("Value $minValue is bigger than the maxValue!");
+		if($minValue > ($max = $this->getMaxValue())){
+			throw new \InvalidArgumentException("Minimum $minValue is greater than the maximum $max");
 		}
 
 		if($this->minValue != $minValue){
@@ -126,8 +126,8 @@ class Attribute{
 	}
 
 	public function setMaxValue(float $maxValue){
-		if($maxValue < $this->getMinValue()){
-			throw new \InvalidArgumentException("Value $maxValue is bigger than the minValue!");
+		if($maxValue < ($min = $this->getMinValue())){
+			throw new \InvalidArgumentException("Maximum $maxValue is less than the minimum $min");
 		}
 
 		if($this->maxValue != $maxValue){
@@ -143,7 +143,7 @@ class Attribute{
 
 	public function setDefaultValue(float $defaultValue){
 		if($defaultValue > $this->getMaxValue() or $defaultValue < $this->getMinValue()){
-			throw new \InvalidArgumentException("Value $defaultValue exceeds the range!");
+			throw new \InvalidArgumentException("Default $defaultValue is outside the range " . $this->getMinValue() . " - " . $this->getMaxValue());
 		}
 
 		if($this->defaultValue !== $defaultValue){
@@ -171,7 +171,7 @@ class Attribute{
 	public function setValue(float $value, bool $fit = false, bool $forceSend = false){
 		if($value > $this->getMaxValue() or $value < $this->getMinValue()){
 			if(!$fit){
-				throw new \InvalidArgumentException("Value $value exceeds the range!");
+				throw new \InvalidArgumentException("Value $value is outside the range " . $this->getMinValue() . " - " . $this->getMaxValue());
 			}
 			$value = min(max($value, $this->getMinValue()), $this->getMaxValue());
 		}
diff --git a/src/pocketmine/network/mcpe/protocol/ClientboundMapItemDataPacket.php b/src/pocketmine/network/mcpe/protocol/ClientboundMapItemDataPacket.php
index 48b1695dd..7045178f2 100644
--- a/src/pocketmine/network/mcpe/protocol/ClientboundMapItemDataPacket.php
+++ b/src/pocketmine/network/mcpe/protocol/ClientboundMapItemDataPacket.php
@@ -114,7 +114,9 @@ class ClientboundMapItemDataPacket extends DataPacket{
 			$this->yOffset = $this->getVarInt();
 
 			$count = $this->getUnsignedVarInt();
-			assert($count === $this->width * $this->height);
+			if($count !== $this->width * $this->height){
+				throw new \UnexpectedValueException("Expected colour count of " . ($this->height * $this->width) . " (height $this->height * width $this->width), got $count");
+			}
 
 			for($y = 0; $y < $this->height; ++$y){
 				for($x = 0; $x < $this->width; ++$x){
diff --git a/src/pocketmine/network/mcpe/protocol/DataPacket.php b/src/pocketmine/network/mcpe/protocol/DataPacket.php
index 3c1ae71f1..0482bb5a6 100644
--- a/src/pocketmine/network/mcpe/protocol/DataPacket.php
+++ b/src/pocketmine/network/mcpe/protocol/DataPacket.php
@@ -69,7 +69,9 @@ abstract class DataPacket extends NetworkBinaryStream{
 
 	protected function decodeHeader() : void{
 		$pid = $this->getUnsignedVarInt();
-		assert($pid === static::NETWORK_ID);
+		if($pid !== static::NETWORK_ID){
+			throw new \UnexpectedValueException("Expected " . static::NETWORK_ID . " for packet ID, got $pid");
+		}
 	}
 
 	/**