diff --git a/src/pocketmine/level/light/LightUpdate.php b/src/pocketmine/level/light/LightUpdate.php
index 2ee6d3479..22c7fe18b 100644
--- a/src/pocketmine/level/light/LightUpdate.php
+++ b/src/pocketmine/level/light/LightUpdate.php
@@ -109,6 +109,8 @@ abstract class LightUpdate{
 		while(!$this->spreadQueue->isEmpty()){
 			list($x, $y, $z) = $this->spreadQueue->dequeue();
 
+			unset($this->spreadVisited[Level::blockHash($x, $y, $z)]);
+
 			if(!$this->subChunkHandler->moveTo($x, $y, $z)){
 				continue;
 			}