From 75df6973dfeac8c7a2edba5f4863d3216d4d23dd Mon Sep 17 00:00:00 2001
From: "Dylan K. Taylor" <odigiman@gmail.com>
Date: Sat, 22 Dec 2018 13:13:14 +0000
Subject: [PATCH] LevelDB: Account for 2D maps tag being missing I don't know
 why this would be missing, but in some cases it is, as seen in the crash
 archive. Whatever the case, we shouldn't be shitting the bed because of this.

---
 src/pocketmine/level/format/io/leveldb/LevelDB.php | 13 ++++++++++---
 1 file changed, 10 insertions(+), 3 deletions(-)

diff --git a/src/pocketmine/level/format/io/leveldb/LevelDB.php b/src/pocketmine/level/format/io/leveldb/LevelDB.php
index 725c572ff1..6cb56b2384 100644
--- a/src/pocketmine/level/format/io/leveldb/LevelDB.php
+++ b/src/pocketmine/level/format/io/leveldb/LevelDB.php
@@ -283,6 +283,11 @@ class LevelDB extends BaseLevelProvider{
 		/** @var SubChunk[] $subChunks */
 		$subChunks = [];
 
+		/** @var int[] $heightMap */
+		$heightMap = [];
+		/** @var string $biomeIds */
+		$biomeIds = "";
+
 		/** @var bool $lightPopulated */
 		$lightPopulated = true;
 
@@ -325,10 +330,12 @@ class LevelDB extends BaseLevelProvider{
 					}
 				}
 
-				$binaryStream->setBuffer($this->db->get($index . self::TAG_DATA_2D), 0);
+				if(($maps2d = $this->db->get($index . self::TAG_DATA_2D)) !== false){
+					$binaryStream->setBuffer($maps2d, 0);
 
-				$heightMap = array_values(unpack("v*", $binaryStream->get(512)));
-				$biomeIds = $binaryStream->get(256);
+					$heightMap = array_values(unpack("v*", $binaryStream->get(512)));
+					$biomeIds = $binaryStream->get(256);
+				}
 				break;
 			case 2: // < MCPE 1.0
 				$binaryStream->setBuffer($this->db->get($index . self::TAG_LEGACY_TERRAIN));