diff --git a/phpstan.neon.dist b/phpstan.neon.dist
index c8556a7fd..3880ad102 100644
--- a/phpstan.neon.dist
+++ b/phpstan.neon.dist
@@ -8,7 +8,7 @@ includes:
 	- tests/phpstan/configs/runtime-type-checks.neon
 
 parameters:
-	level: 4
+	level: 5
 	autoload_files:
 		- tests/phpstan/bootstrap.php
 		- src/pocketmine/PocketMine.php
diff --git a/src/pocketmine/Server.php b/src/pocketmine/Server.php
index 0e012e0cd..6de2b0fb7 100644
--- a/src/pocketmine/Server.php
+++ b/src/pocketmine/Server.php
@@ -2247,6 +2247,9 @@ class Server{
 		$this->crashDump();
 	}
 
+	/**
+	 * @return void
+	 */
 	public function crashDump(){
 		while(@ob_end_flush()){}
 		if(!$this->isRunning){
diff --git a/src/pocketmine/block/EnderChest.php b/src/pocketmine/block/EnderChest.php
index ea5afb257..1f1f5e6dd 100644
--- a/src/pocketmine/block/EnderChest.php
+++ b/src/pocketmine/block/EnderChest.php
@@ -84,6 +84,9 @@ class EnderChest extends Chest{
 				$enderChest = $t;
 			}else{
 				$enderChest = Tile::createTile(Tile::ENDER_CHEST, $this->getLevel(), TileEnderChest::createNBT($this));
+				if(!($enderChest instanceof TileEnderChest)){
+					return true;
+				}
 			}
 
 			if(!$this->getSide(Vector3::SIDE_UP)->isTransparent()){
diff --git a/src/pocketmine/entity/Entity.php b/src/pocketmine/entity/Entity.php
index a2b3468e9..22d1e79fc 100644
--- a/src/pocketmine/entity/Entity.php
+++ b/src/pocketmine/entity/Entity.php
@@ -463,12 +463,12 @@ abstract class Entity extends Location implements Metadatable, EntityIds{
 	/** @var Block[]|null */
 	protected $blocksAround = null;
 
-	/** @var float|null */
-	public $lastX = null;
-	/** @var float|null */
-	public $lastY = null;
-	/** @var float|null */
-	public $lastZ = null;
+	/** @var float */
+	public $lastX;
+	/** @var float */
+	public $lastY;
+	/** @var float */
+	public $lastZ;
 
 	/** @var Vector3 */
 	protected $motion;
diff --git a/src/pocketmine/inventory/PlayerInventory.php b/src/pocketmine/inventory/PlayerInventory.php
index 067eccb41..6ffca62df 100644
--- a/src/pocketmine/inventory/PlayerInventory.php
+++ b/src/pocketmine/inventory/PlayerInventory.php
@@ -66,19 +66,23 @@ class PlayerInventory extends BaseInventory{
 	 * @return bool if the equipment change was successful, false if not.
 	 */
 	public function equipItem(int $hotbarSlot) : bool{
+		$holder = $this->getHolder();
 		if(!$this->isHotbarSlot($hotbarSlot)){
-			$this->sendContents($this->getHolder());
+			if($holder instanceof Player){
+				$this->sendContents($holder);
+			}
 			return false;
 		}
 
-		$ev = new PlayerItemHeldEvent($this->getHolder(), $this->getItem($hotbarSlot), $hotbarSlot);
-		$ev->call();
+		if($holder instanceof Player){
+			$ev = new PlayerItemHeldEvent($holder, $this->getItem($hotbarSlot), $hotbarSlot);
+			$ev->call();
 
-		if($ev->isCancelled()){
-			$this->sendHeldItem($this->getHolder());
-			return false;
+			if($ev->isCancelled()){
+				$this->sendHeldItem($holder);
+				return false;
+			}
 		}
-
 		$this->setHeldItemIndex($hotbarSlot, false);
 
 		return true;
diff --git a/src/pocketmine/lang/BaseLang.php b/src/pocketmine/lang/BaseLang.php
index aece04221..0ec3a68f2 100644
--- a/src/pocketmine/lang/BaseLang.php
+++ b/src/pocketmine/lang/BaseLang.php
@@ -115,9 +115,9 @@ class BaseLang{
 	}
 
 	/**
-	 * @param string      $str
-	 * @param string[]    $params
-	 * @param string|null $onlyPrefix
+	 * @param string               $str
+	 * @param (float|int|string)[] $params
+	 * @param string|null          $onlyPrefix
 	 *
 	 * @return string
 	 */
diff --git a/src/pocketmine/lang/TranslationContainer.php b/src/pocketmine/lang/TranslationContainer.php
index aa9bf3d01..69461b281 100644
--- a/src/pocketmine/lang/TranslationContainer.php
+++ b/src/pocketmine/lang/TranslationContainer.php
@@ -31,8 +31,8 @@ class TranslationContainer extends TextContainer{
 	protected $params = [];
 
 	/**
-	 * @param string   $text
-	 * @param string[] $params
+	 * @param string               $text
+	 * @param (float|int|string)[] $params
 	 */
 	public function __construct(string $text, array $params = []){
 		parent::__construct($text);
diff --git a/src/pocketmine/level/Location.php b/src/pocketmine/level/Location.php
index d29f8b26c..435e82575 100644
--- a/src/pocketmine/level/Location.php
+++ b/src/pocketmine/level/Location.php
@@ -33,12 +33,12 @@ class Location extends Position{
 	public $pitch;
 
 	/**
-	 * @param int   $x
-	 * @param int   $y
-	 * @param int   $z
-	 * @param float $yaw
-	 * @param float $pitch
-	 * @param Level $level
+	 * @param float|int $x
+	 * @param float|int $y
+	 * @param float|int $z
+	 * @param float     $yaw
+	 * @param float     $pitch
+	 * @param Level     $level
 	 */
 	public function __construct($x = 0, $y = 0, $z = 0, $yaw = 0.0, $pitch = 0.0, Level $level = null){
 		$this->yaw = $yaw;
diff --git a/src/pocketmine/level/Position.php b/src/pocketmine/level/Position.php
index 608c412c5..cb8ea44b7 100644
--- a/src/pocketmine/level/Position.php
+++ b/src/pocketmine/level/Position.php
@@ -33,10 +33,10 @@ class Position extends Vector3{
 	public $level = null;
 
 	/**
-	 * @param int   $x
-	 * @param int   $y
-	 * @param int   $z
-	 * @param Level $level
+	 * @param float|int $x
+	 * @param float|int $y
+	 * @param float|int $z
+	 * @param Level     $level
 	 */
 	public function __construct($x = 0, $y = 0, $z = 0, Level $level = null){
 		parent::__construct($x, $y, $z);
diff --git a/src/pocketmine/level/format/io/leveldb/LevelDB.php b/src/pocketmine/level/format/io/leveldb/LevelDB.php
index 10229f49c..a6aef3060 100644
--- a/src/pocketmine/level/format/io/leveldb/LevelDB.php
+++ b/src/pocketmine/level/format/io/leveldb/LevelDB.php
@@ -26,6 +26,7 @@ namespace pocketmine\level\format\io\leveldb;
 use pocketmine\level\format\Chunk;
 use pocketmine\level\format\io\BaseLevelProvider;
 use pocketmine\level\format\io\ChunkUtils;
+use pocketmine\level\format\io\exception\CorruptedChunkException;
 use pocketmine\level\format\io\exception\UnsupportedChunkFormatException;
 use pocketmine\level\format\SubChunk;
 use pocketmine\level\generator\Flat;
@@ -414,24 +415,27 @@ class LevelDB extends BaseLevelProvider{
 		/** @var CompoundTag[] $entities */
 		$entities = [];
 		if(($entityData = $this->db->get($index . self::TAG_ENTITY)) !== false and $entityData !== ""){
-			$entities = $nbt->read($entityData, true);
-			if(!is_array($entities)){
-				$entities = [$entities];
-			}
-		}
-
-		/** @var CompoundTag $entityNBT */
-		foreach($entities as $entityNBT){
-			if($entityNBT->hasTag("id", IntTag::class)){
-				$entityNBT->setInt("id", $entityNBT->getInt("id") & 0xff); //remove type flags - TODO: use these instead of removing them)
+			$entityTags = $nbt->read($entityData, true);
+			foreach((is_array($entityTags) ? $entityTags : [$entityTags]) as $entityTag){
+				if(!($entityTag instanceof CompoundTag)){
+					throw new CorruptedChunkException("Entity root tag should be TAG_Compound");
+				}
+				if($entityTag->hasTag("id", IntTag::class)){
+					$entityTag->setInt("id", $entityTag->getInt("id") & 0xff); //remove type flags - TODO: use these instead of removing them)
+				}
+				$entities[] = $entityTag;
 			}
 		}
 
+		/** @var CompoundTag[] $tiles */
 		$tiles = [];
 		if(($tileData = $this->db->get($index . self::TAG_BLOCK_ENTITY)) !== false and $tileData !== ""){
-			$tiles = $nbt->read($tileData, true);
-			if(!is_array($tiles)){
-				$tiles = [$tiles];
+			$tileTags = $nbt->read($tileData, true);
+			foreach((is_array($tileTags) ? $tileTags : [$tileTags]) as $tileTag){
+				if(!($tileTag instanceof CompoundTag)){
+					throw new CorruptedChunkException("Tile root tag should be TAG_Compound");
+				}
+				$tiles[] = $tileTag;
 			}
 		}
 
diff --git a/src/pocketmine/level/format/io/region/Anvil.php b/src/pocketmine/level/format/io/region/Anvil.php
index 12b1cc965..d602fd8a2 100644
--- a/src/pocketmine/level/format/io/region/Anvil.php
+++ b/src/pocketmine/level/format/io/region/Anvil.php
@@ -51,7 +51,7 @@ class Anvil extends McRegion{
 
 		$subChunks = [];
 		foreach($chunk->getSubChunks() as $y => $subChunk){
-			if($subChunk->isEmpty()){
+			if(!($subChunk instanceof SubChunk) or $subChunk->isEmpty()){
 				continue;
 			}
 
@@ -122,8 +122,8 @@ class Anvil extends McRegion{
 			$chunk->getInt("xPos"),
 			$chunk->getInt("zPos"),
 			$subChunks,
-			$chunk->hasTag("Entities", ListTag::class) ? $chunk->getListTag("Entities")->getValue() : [],
-			$chunk->hasTag("TileEntities", ListTag::class) ? $chunk->getListTag("TileEntities")->getValue() : [],
+			$chunk->hasTag("Entities", ListTag::class) ? self::getCompoundList("Entities", $chunk->getListTag("Entities")) : [],
+			$chunk->hasTag("TileEntities", ListTag::class) ? self::getCompoundList("TileEntities", $chunk->getListTag("TileEntities")) : [],
 			$biomeIds,
 			$chunk->getIntArray("HeightMap", [])
 		);
diff --git a/src/pocketmine/level/format/io/region/McRegion.php b/src/pocketmine/level/format/io/region/McRegion.php
index 9f2871635..51cad2438 100644
--- a/src/pocketmine/level/format/io/region/McRegion.php
+++ b/src/pocketmine/level/format/io/region/McRegion.php
@@ -194,8 +194,8 @@ class McRegion extends BaseLevelProvider{
 			$chunk->getInt("xPos"),
 			$chunk->getInt("zPos"),
 			$subChunks,
-			$chunk->hasTag("Entities", ListTag::class) ? $chunk->getListTag("Entities")->getValue() : [],
-			$chunk->hasTag("TileEntities", ListTag::class) ? $chunk->getListTag("TileEntities")->getValue() : [],
+			$chunk->hasTag("Entities", ListTag::class) ? self::getCompoundList("Entities", $chunk->getListTag("Entities")) : [],
+			$chunk->hasTag("TileEntities", ListTag::class) ? self::getCompoundList("TileEntities", $chunk->getListTag("TileEntities")) : [],
 			$biomeIds,
 			$heightMap
 		);
@@ -205,6 +205,31 @@ class McRegion extends BaseLevelProvider{
 		return $result;
 	}
 
+	/**
+	 * @param string $context
+	 * @param ListTag $list
+	 *
+	 * @return CompoundTag[]
+	 * @throws CorruptedChunkException
+	 */
+	protected static function getCompoundList(string $context, ListTag $list) : array{
+		if($list->count() === 0){ //empty lists might have wrong types, we don't care
+			return [];
+		}
+		if($list->getTagType() !== NBT::TAG_Compound){
+			throw new CorruptedChunkException("Expected TAG_List<TAG_Compound> for '$context'");
+		}
+		$result = [];
+		foreach($list as $tag){
+			if(!($tag instanceof CompoundTag)){
+				//this should never happen, but it's still possible due to lack of native type safety
+				throw new CorruptedChunkException("Expected TAG_List<TAG_Compound> for '$context'");
+			}
+			$result[] = $tag;
+		}
+		return $result;
+	}
+
 	public static function getProviderName() : string{
 		return "mcregion";
 	}
diff --git a/src/pocketmine/network/CompressBatchedTask.php b/src/pocketmine/network/CompressBatchedTask.php
index 86b784d31..d0f6757c2 100644
--- a/src/pocketmine/network/CompressBatchedTask.php
+++ b/src/pocketmine/network/CompressBatchedTask.php
@@ -35,7 +35,7 @@ class CompressBatchedTask extends AsyncTask{
 
 	/**
 	 * @param BatchPacket $batch
-	 * @param string[]    $targets
+	 * @param Player[]    $targets
 	 */
 	public function __construct(BatchPacket $batch, array $targets){
 		$this->data = $batch->payload;