diff --git a/src/pocketmine/level/Level.php b/src/pocketmine/level/Level.php
index 9a6e282a2..46f3eb08a 100644
--- a/src/pocketmine/level/Level.php
+++ b/src/pocketmine/level/Level.php
@@ -2887,6 +2887,7 @@ class Level implements ChunkManager, Metadatable{
 		unset($this->chunkTickList[$chunkHash]);
 		unset($this->chunkCache[$chunkHash]);
 		unset($this->blockCache[$chunkHash]);
+		unset($this->changedBlocks[$chunkHash]);
 
 		$this->timings->doChunkUnload->stopTiming();