diff --git a/src/serializer/BitSet.php b/src/serializer/BitSet.php
index 3c2d0e85..c848e148 100644
--- a/src/serializer/BitSet.php
+++ b/src/serializer/BitSet.php
@@ -129,7 +129,7 @@ public function write(PacketSerializer $out, int $length = null) : void{
 			$nextShift = $currentShift + self::SHIFT;
 			if($nextShift >= self::INT_BITS){
 				$nextShift -= self::INT_BITS;
-				$bits |= ($parts[++$currentIndex] ?? 0) << (self::SHIFT - $nextShift);
+				$bits |= $parts[++$currentIndex] << (self::SHIFT - $nextShift);
 			}
 			$currentShift = $nextShift;
 
diff --git a/tests/phpstan/configs/phpstan-bugs.neon b/tests/phpstan/configs/phpstan-bugs.neon
index 5d525eb1..969e9629 100644
--- a/tests/phpstan/configs/phpstan-bugs.neon
+++ b/tests/phpstan/configs/phpstan-bugs.neon
@@ -9,12 +9,3 @@ parameters:
 			message: "#^Parameter \\#3 \\$packets of static method pocketmine\\\\network\\\\mcpe\\\\protocol\\\\serializer\\\\PacketBatch\\:\\:encodePackets\\(\\) expects array\\<int, pocketmine\\\\network\\\\mcpe\\\\protocol\\\\Packet\\>, array\\<int\\|string, pocketmine\\\\network\\\\mcpe\\\\protocol\\\\Packet\\> given\\.$#"
 			count: 1
 			path: ../../../src/serializer/PacketBatch.php
-		-
-			message: "#^Parameter \\#2 \\$parts of class pocketmine\\\\network\\\\mcpe\\\\protocol\\\\serializer\\\\BitSet constructor expects array\\<int\\>, array\\<int, float\\> given\\.$#"
-			count: 1
-			path: tests/phpunit/BitSetTest.php
-
-		-
-			message: "#^Parameter \\#2 \\$parts of class pocketmine\\\\network\\\\mcpe\\\\protocol\\\\serializer\\\\BitSet constructor expects array\\<int\\>, array\\<int, float\\|int\\> given\\.$#"
-			count: 1
-			path: tests/phpunit/BitSetTest.php
diff --git a/tests/phpunit/BitSetTest.php b/tests/phpunit/BitSetTest.php
index 8e417e54..db2bc9ee 100644
--- a/tests/phpunit/BitSetTest.php
+++ b/tests/phpunit/BitSetTest.php
@@ -17,8 +17,6 @@
 use PHPUnit\Framework\TestCase;
 use pocketmine\network\mcpe\protocol\serializer\BitSet;
 use pocketmine\network\mcpe\protocol\serializer\PacketSerializer;
-use function PHPUnit\Framework\assertTrue;
-use function var_dump;
 
 class BitSetTest extends TestCase{
 
@@ -34,12 +32,12 @@ public function testBitSet() : void{
 		$packetSerializer = PacketSerializer::decoder(ProtocolInfo::CURRENT_PROTOCOL, $packetSerializer->getBuffer(), 0);
 		$readTest = BitSet::read($packetSerializer, 65);
 
-		assertTrue($this->setsEqual($writeTest, $readTest));
+		self::assertEqualBitSets($writeTest, $readTest);
 	}
 
 	public function testBitSetConstructor() : void{
-		$test = new BitSet(65, [-9223372036854775808, 1]);
-		$test2 = new BitSet(65, [-9223372036854775808]);
+		$test = new BitSet(65, [-9223372036854775807 - 1, 1]);
+		$test2 = new BitSet(65, [-9223372036854775807 - 1]);
 
 		$test2->set(64, true);
 
@@ -62,7 +60,7 @@ public function testBitSetParts() : void{
 		$packetSerializer = PacketSerializer::decoder(ProtocolInfo::CURRENT_PROTOCOL, $packetSerializer->getBuffer(), 0);
 		$readTest = BitSet::read($packetSerializer, 128);
 
-		assertTrue($this->setsEqual($writeTest, $readTest));
+		self::assertEqualBitSets($writeTest, $readTest);
 	}
 
 	public function testVarUnsignedLongCompatibility() : void{
@@ -75,23 +73,16 @@ public function testVarUnsignedLongCompatibility() : void{
 		$expectedResult = new BitSet(64);
 		$expectedResult->set(63, true);
 
-		assertTrue($this->setsEqual($expectedResult, $readTest));
+		self::assertEqualBitSets($expectedResult, $readTest);
 	}
 
-	private function setsEqual(BitSet $a, BitSet $b) : bool{
-		$length = $a->getLength();
-		if($length !== $b->getLength()){
-			var_dump($length, $b->getLength());
-			return false;
-		}
+	private static function assertEqualBitSets(BitSet $a, BitSet $b) : void{
+		self::assertEquals($length = $a->getLength(), $b->getLength(), "BitSet lengths are not equal");
 
 		for($i = 0; $i < $length; ++$i){
-			if($a->get($i) !== $b->get($i)){
-				var_dump($i, $a->get($i), $b->get($i));
-				return false;
-			}
+			self::assertEquals($a->get($i), $b->get($i), "BitSet values at index $i are not equal");
 		}
 
-		return $a->getPartsCount() === $b->getPartsCount();
+		self::assertEquals($a->getPartsCount(), $b->getPartsCount(), "BitSet parts count is not equal");
 	}
 }