diff --git a/composer.lock b/composer.lock
index 31b7775ba..166990518 100644
--- a/composer.lock
+++ b/composer.lock
@@ -201,16 +201,16 @@
         },
         {
             "name": "pocketmine/raklib",
-            "version": "0.12.3",
+            "version": "0.12.4",
             "source": {
                 "type": "git",
                 "url": "https://github.com/pmmp/RakLib.git",
-                "reference": "9df7dbcdafeb29403af6a7fa22c8785f758a1145"
+                "reference": "fc1ccc8e61b9033e5372436b2e28a7a95388373f"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/pmmp/RakLib/zipball/9df7dbcdafeb29403af6a7fa22c8785f758a1145",
-                "reference": "9df7dbcdafeb29403af6a7fa22c8785f758a1145",
+                "url": "https://api.github.com/repos/pmmp/RakLib/zipball/fc1ccc8e61b9033e5372436b2e28a7a95388373f",
+                "reference": "fc1ccc8e61b9033e5372436b2e28a7a95388373f",
                 "shasum": ""
             },
             "require": {
@@ -235,10 +235,10 @@
             ],
             "description": "A RakNet server implementation written in PHP",
             "support": {
-                "source": "https://github.com/pmmp/RakLib/tree/0.12.3",
+                "source": "https://github.com/pmmp/RakLib/tree/0.12.4",
                 "issues": "https://github.com/pmmp/RakLib/issues"
             },
-            "time": "2019-04-21T12:15:38+00:00"
+            "time": "2019-05-02T14:53:51+00:00"
         },
         {
             "name": "pocketmine/snooze",
diff --git a/src/pocketmine/Player.php b/src/pocketmine/Player.php
index d2d9926b5..1534d2a71 100644
--- a/src/pocketmine/Player.php
+++ b/src/pocketmine/Player.php
@@ -1065,6 +1065,7 @@ class Player extends Human implements CommandSender, ChunkLoader, IPlayer{
 			return; //avoid player spawning twice (this can only happen on 3.x with a custom malicious client)
 		}
 		$this->spawned = true;
+		$this->setImmobile(false);
 
 		if($this->hasPermission(Server::BROADCAST_CHANNEL_USERS)){
 			PermissionManager::getInstance()->subscribeToPermission(Server::BROADCAST_CHANNEL_USERS, $this);
@@ -1083,7 +1084,6 @@ class Player extends Human implements CommandSender, ChunkLoader, IPlayer{
 			$this->server->broadcastMessage($ev->getJoinMessage());
 		}
 
-		$this->setImmobile(false);
 		$this->noDamageTicks = 60;
 
 		foreach($this->usedChunks as $index => $c){
@@ -2061,7 +2061,13 @@ class Player extends Human implements CommandSender, ChunkLoader, IPlayer{
 			case ResourcePackClientResponsePacket::STATUS_SEND_PACKS:
 				$manager = $this->server->getResourcePackManager();
 				foreach($packet->packIds as $uuid){
-					$pack = $manager->getPackById(substr($uuid, 0, strpos($uuid, "_"))); //dirty hack for mojang's dirty hack for versions
+					//dirty hack for mojang's dirty hack for versions
+					$splitPos = strpos($uuid, "_");
+					if($splitPos !== false){
+						$uuid = substr($uuid, 0, $splitPos);
+					}
+
+					$pack = $manager->getPackById($uuid);
 					if(!($pack instanceof ResourcePack)){
 						//Client requested a resource pack but we don't have it available on the server
 						$this->close("", "disconnectionScreen.resourcePack", true);
diff --git a/src/pocketmine/level/Level.php b/src/pocketmine/level/Level.php
index e70baf6f0..b42ae887e 100644
--- a/src/pocketmine/level/Level.php
+++ b/src/pocketmine/level/Level.php
@@ -26,6 +26,7 @@ declare(strict_types=1);
  */
 namespace pocketmine\level;
 
+use pocketmine\block\Air;
 use pocketmine\block\Block;
 use pocketmine\block\BlockFactory;
 use pocketmine\entity\Entity;
@@ -1797,7 +1798,7 @@ class Level implements ChunkManager, Metadatable{
 		if($player !== null){
 			$ev = new BlockBreakEvent($player, $target, $item, $player->isCreative(), $drops, $xpDrop);
 
-			if(($player->isSurvival() and !$target->isBreakable($item)) or $player->isSpectator()){
+			if($target instanceof Air or ($player->isSurvival() and !$target->isBreakable($item)) or $player->isSpectator()){
 				$ev->setCancelled();
 			}elseif($this->checkSpawnProtection($player, $target)){
 				$ev->setCancelled(); //set it to cancelled so plugins can bypass this