diff --git a/src/pocketmine/level/Level.php b/src/pocketmine/level/Level.php
index 33734c7af..8b29fc824 100644
--- a/src/pocketmine/level/Level.php
+++ b/src/pocketmine/level/Level.php
@@ -2220,8 +2220,8 @@ class Level implements ChunkManager, Metadatable{
 
 
 	public function generateChunk($x, $z){
-		if(!isset($this->chunkGenerationQueue[Level::chunkHash($x, $z)])){
-			$this->chunkGenerationQueue[Level::chunkHash($x, $z)] = true;
+		if(!isset($this->chunkGenerationQueue[$index = Level::chunkHash($x, $z)])){
+			$this->chunkGenerationQueue[$index] = true;
 			$this->server->getGenerationManager()->requestChunk($this, $x, $z);
 		}
 	}
diff --git a/src/pocketmine/level/generator/GenerationChunkManager.php b/src/pocketmine/level/generator/GenerationChunkManager.php
index 37347b70f..40bf3a3ab 100644
--- a/src/pocketmine/level/generator/GenerationChunkManager.php
+++ b/src/pocketmine/level/generator/GenerationChunkManager.php
@@ -179,7 +179,7 @@ class GenerationChunkManager implements ChunkManager{
 
 	protected function requestChunk($chunkX, $chunkZ){
 		$chunk = $this->manager->requestChunk($this->levelID, $chunkX, $chunkZ);
-		$this->chunks[$index = Level::chunkHash($chunkX, $chunkZ)] = $chunk;
+		$this->chunks[Level::chunkHash($chunkX, $chunkZ)] = $chunk;
 
 		return $chunk;
 	}
diff --git a/src/pocketmine/level/generator/GenerationLevelManager.php b/src/pocketmine/level/generator/GenerationLevelManager.php
index 0ab3e706d..bdb5f6271 100644
--- a/src/pocketmine/level/generator/GenerationLevelManager.php
+++ b/src/pocketmine/level/generator/GenerationLevelManager.php
@@ -83,7 +83,8 @@ class GenerationLevelManager extends GenerationManager{
 				if(count($chunks) === 0){
 					unset($this->requestQueue[$levelID]);
 				}else{
-					Level::getXZ($key = key($chunks), $chunkX, $chunkZ);
+					$key = key($chunks);
+					Level::getXZ($key, $chunkX, $chunkZ);
 					unset($this->requestQueue[$levelID][$key]);
 					$this->generateChunk($levelID, $chunkX, $chunkZ);
 					++$count;
diff --git a/src/pocketmine/level/generator/GenerationManager.php b/src/pocketmine/level/generator/GenerationManager.php
index a27bc00d1..692152959 100644
--- a/src/pocketmine/level/generator/GenerationManager.php
+++ b/src/pocketmine/level/generator/GenerationManager.php
@@ -126,7 +126,8 @@ class GenerationManager{
 						if(count($chunks) === 0){
 							unset($this->requestQueue[$levelID]);
 						}else{
-							Level::getXZ($key = key($chunks), $chunkX, $chunkZ);
+							$key = key($chunks);
+							Level::getXZ($key, $chunkX, $chunkZ);
 							unset($this->requestQueue[$levelID][$key]);
 							$this->generateChunk($levelID, $chunkX, $chunkZ);
 						}