diff --git a/src/pocketmine/PocketMine.php b/src/pocketmine/PocketMine.php
index 71d647fda..c2693111b 100644
--- a/src/pocketmine/PocketMine.php
+++ b/src/pocketmine/PocketMine.php
@@ -459,6 +459,7 @@ namespace pocketmine {
 		}
 
 		$extensions = [
+			"bcmath" => "BC Math",
 			"curl" => "cURL",
 			"json" => "JSON",
 			"mbstring" => "Multibyte String",
diff --git a/src/pocketmine/Server.php b/src/pocketmine/Server.php
index cd1c19fa6..ec5cb174b 100644
--- a/src/pocketmine/Server.php
+++ b/src/pocketmine/Server.php
@@ -1639,6 +1639,12 @@ class Server{
 			foreach((array) $this->getProperty("worlds", []) as $name => $worldSetting){
 				if($this->loadLevel($name) === false){
 					$seed = $this->getProperty("worlds.$name.seed", time());
+					if(is_string($seed) and !is_numeric($seed)){
+						$seed = Utils::javaStringHash($seed);
+					}elseif(!is_int($seed)){
+						$seed = (int) $seed;
+					}
+
 					$options = explode(":", $this->getProperty("worlds.$name.generator", Generator::getGenerator("default")));
 					$generator = Generator::getGenerator(array_shift($options));
 					if(count($options) > 0){
diff --git a/src/raklib b/src/raklib
index 226772184..97d2faf69 160000
--- a/src/raklib
+++ b/src/raklib
@@ -1 +1 @@
-Subproject commit 226772184b6cb3c014477feb41e55ec22850f2dd
+Subproject commit 97d2faf6928014ff953922d030f67b1e8b046dd7