fixed unsupported leveldb format versions crashing the server

src/pocketmine/Server.php

@@ -50,6 +50,7 @@ use pocketmine\lang\Language;
 use pocketmine\lang\LanguageNotFoundException;
 use pocketmine\lang\TextContainer;
 use pocketmine\level\biome\Biome;
+use pocketmine\level\format\io\exception\UnsupportedLevelFormatException;
 use pocketmine\level\format\io\LevelProvider;
 use pocketmine\level\format\io\LevelProviderManager;
 use pocketmine\level\generator\Generator;
@@ -1044,8 +1045,13 @@ class Server{
 		}
 		$providerClass = array_shift($providers);
 
-		/** @see LevelProvider::__construct() */
+		try{
-		$level = new Level($this, $name, new $providerClass($path));
+			/** @see LevelProvider::__construct() */
+			$level = new Level($this, $name, new $providerClass($path));
+		}catch(UnsupportedLevelFormatException $e){
+			$this->logger->error($this->language->translateString("pocketmine.level.loadError", [$name, $e->getMessage()]));
+			return false;
+		}
 
 		$this->levels[$level->getId()] = $level;
 

src/pocketmine/level/format/io/data/BedrockLevelData.php

@@ -23,10 +23,10 @@ declare(strict_types=1);
 
 namespace pocketmine\level\format\io\data;
 
+use pocketmine\level\format\io\exception\UnsupportedLevelFormatException;
 use pocketmine\level\generator\Flat;
 use pocketmine\level\generator\GeneratorManager;
 use pocketmine\level\Level;
-use pocketmine\level\LevelException;
 use pocketmine\nbt\LittleEndianNBTStream;
 use pocketmine\nbt\tag\ByteTag;
 use pocketmine\nbt\tag\CompoundTag;
@@ -103,7 +103,7 @@ class BedrockLevelData extends BaseNbtLevelData{
 		if($levelData instanceof CompoundTag){
 			$version = $levelData->getInt("StorageVersion", INT32_MAX, true);
 			if($version > self::CURRENT_STORAGE_VERSION){
-				throw new LevelException("Specified LevelDB world format version ($version) is not supported by " . \pocketmine\NAME);
+				throw new UnsupportedLevelFormatException("Specified LevelDB world format version ($version) is not supported by " . \pocketmine\NAME);
 			}
 
 			return $levelData;
@@ -125,9 +125,9 @@ class BedrockLevelData extends BaseNbtLevelData{
 						$this->compoundTag->setString("generatorOptions", "");
 						break;
 					case self::GENERATOR_LIMITED:
-						throw new LevelException("Limited worlds are not currently supported");
+						throw new UnsupportedLevelFormatException("Limited worlds are not currently supported");
 					default:
-						throw new LevelException("Unknown LevelDB world format type, this level cannot be loaded");
+						throw new UnsupportedLevelFormatException("Unknown LevelDB world format type, this level cannot be loaded");
 				}
 			}else{
 				$this->compoundTag->setString("generatorName", "default");

src/pocketmine/level/format/io/exception/UnsupportedLevelFormatException.php

@@ -0,0 +1,28 @@
+<?php
+
+/*
+ *
+ *  ____            _        _   __  __ _                  __  __ ____
+ * |  _ \ ___   ___| | _____| |_|  \/  (_)_ __   ___      |  \/  |  _ \
+ * | |_) / _ \ / __| |/ / _ \ __| |\/| | | '_ \ / _ \_____| |\/| | |_) |
+ * |  __/ (_) | (__|   <  __/ |_| |  | | | | | |  __/_____| |  | |  __/
+ * |_|   \___/ \___|_|\_\___|\__|_|  |_|_|_| |_|\___|     |_|  |_|_|
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * @author PocketMine Team
+ * @link http://www.pocketmine.net/
+ *
+ *
+*/
+
+declare(strict_types=1);
+
+namespace pocketmine\level\format\io\exception;
+
+class UnsupportedLevelFormatException extends \RuntimeException{
+
+}

src/pocketmine/level/format/io/leveldb/LevelDB.php

@@ -28,9 +28,9 @@ use pocketmine\level\format\io\BaseLevelProvider;
 use pocketmine\level\format\io\ChunkUtils;
 use pocketmine\level\format\io\data\BedrockLevelData;
 use pocketmine\level\format\io\exception\UnsupportedChunkFormatException;
+use pocketmine\level\format\io\exception\UnsupportedLevelFormatException;
 use pocketmine\level\format\io\LevelData;
 use pocketmine\level\format\SubChunk;
-use pocketmine\level\LevelException;
 use pocketmine\nbt\LittleEndianNBTStream;
 use pocketmine\nbt\tag\CompoundTag;
 use pocketmine\nbt\tag\IntTag;
@@ -70,11 +70,11 @@ class LevelDB extends BaseLevelProvider{
 
 	private static function checkForLevelDBExtension() : void{
 		if(!extension_loaded('leveldb')){
-			throw new LevelException("The leveldb PHP extension is required to use this world format");
+			throw new UnsupportedLevelFormatException("The leveldb PHP extension is required to use this world format");
 		}
 
 		if(!defined('LEVELDB_ZLIB_RAW_COMPRESSION')){
-			throw new LevelException("Given version of php-leveldb doesn't support zlib raw compression");
+			throw new UnsupportedLevelFormatException("Given version of php-leveldb doesn't support zlib raw compression");
 		}
 	}