diff --git a/src/main/java/de/bixilon/minosoft/config/StaticConfiguration.java b/src/main/java/de/bixilon/minosoft/config/StaticConfiguration.java
index 2264c6e0f..9ae2a585f 100644
--- a/src/main/java/de/bixilon/minosoft/config/StaticConfiguration.java
+++ b/src/main/java/de/bixilon/minosoft/config/StaticConfiguration.java
@@ -13,6 +13,7 @@
 
 package de.bixilon.minosoft.config;
 
+import com.google.common.base.StandardSystemProperty;
 import de.bixilon.minosoft.util.OSUtil;
 
 import java.io.File;
@@ -29,7 +30,7 @@ public class StaticConfiguration {
     static {
         // Sets Config.homeDir to the correct folder per OS
         String homeDir;
-        homeDir = System.getProperty("user.home");
+        homeDir = System.getProperty(StandardSystemProperty.USER_HOME.key());
         if (!homeDir.endsWith(File.separator)) {
             homeDir += "/";
         }
diff --git a/src/main/java/de/bixilon/minosoft/protocol/packets/serverbound/play/PacketPlayerPositionAndRotationSending.java b/src/main/java/de/bixilon/minosoft/protocol/packets/serverbound/play/PacketPlayerPositionAndRotationSending.java
index f1e5e6526..a1a18b6e5 100644
--- a/src/main/java/de/bixilon/minosoft/protocol/packets/serverbound/play/PacketPlayerPositionAndRotationSending.java
+++ b/src/main/java/de/bixilon/minosoft/protocol/packets/serverbound/play/PacketPlayerPositionAndRotationSending.java
@@ -42,7 +42,7 @@ public class PacketPlayerPositionAndRotationSending implements ServerboundPacket
     public PacketPlayerPositionAndRotationSending(double x, double feetY, double z, float yaw, float pitch, boolean onGround) {
         this.x = x;
         this.feetY = feetY;
-        this.headY = feetY - 1.62F;
+        this.headY = feetY + 1.62F;
         this.z = z;
         this.yaw = yaw;
         this.pitch = pitch;
diff --git a/src/main/java/de/bixilon/minosoft/protocol/protocol/CryptManager.java b/src/main/java/de/bixilon/minosoft/protocol/protocol/CryptManager.java
index b2d71ed25..0c4c96e5f 100644
--- a/src/main/java/de/bixilon/minosoft/protocol/protocol/CryptManager.java
+++ b/src/main/java/de/bixilon/minosoft/protocol/protocol/CryptManager.java
@@ -15,7 +15,7 @@ package de.bixilon.minosoft.protocol.protocol;
 
 import javax.crypto.*;
 import javax.crypto.spec.IvParameterSpec;
-import java.io.UnsupportedEncodingException;
+import java.nio.charset.StandardCharsets;
 import java.security.*;
 import java.security.spec.InvalidKeySpecException;
 import java.security.spec.X509EncodedKeySpec;
@@ -29,8 +29,8 @@ public class CryptManager {
             return key.generateKey();
         } catch (NoSuchAlgorithmException e) {
             e.printStackTrace();
+            throw new RuntimeException(e);
         }
-        return null;
     }
 
     public static KeyPair createNewKeyPair() {
@@ -40,17 +40,11 @@ public class CryptManager {
             return keyPair.generateKeyPair();
         } catch (NoSuchAlgorithmException e) {
             e.printStackTrace();
+            throw new RuntimeException(e);
         }
-        return null;
     }
-
     public static byte[] getServerHash(String serverId, PublicKey publicKey, SecretKey secretKey) {
-        try {
-            return digestOperation(serverId.getBytes("ISO_8859_1"), secretKey.getEncoded(), publicKey.getEncoded());
-        } catch (UnsupportedEncodingException e) {
-            e.printStackTrace();
-            return null;
-        }
+        return digestOperation(serverId.getBytes(StandardCharsets.ISO_8859_1), secretKey.getEncoded(), publicKey.getEncoded());
     }
 
     static byte[] digestOperation(byte[]... bytes) {
@@ -62,8 +56,8 @@ public class CryptManager {
             return disgest.digest();
         } catch (NoSuchAlgorithmException e) {
             e.printStackTrace();
+            throw new RuntimeException(e);
         }
-        return null;
     }
 
     public static PublicKey decodePublicKey(byte[] key) {
@@ -73,32 +67,32 @@ public class CryptManager {
             return keyFactory.generatePublic(keySpec);
         } catch (NoSuchAlgorithmException | InvalidKeySpecException e) {
             e.printStackTrace();
+            throw new RuntimeException(e);
         }
-        return null;
     }
 
     public static byte[] encryptData(Key key, byte[] data) {
         return cipherOperation(1, key, data);
     }
 
-    static byte[] cipherOperation(int p_75885_0_, Key key, byte[] data) {
+    static byte[] cipherOperation(int opMode, Key key, byte[] data) {
         try {
-            return createTheCipherInstance(p_75885_0_, key.getAlgorithm(), key).doFinal(data);
+            return createTheCipherInstance(opMode, key.getAlgorithm(), key).doFinal(data);
         } catch (IllegalBlockSizeException | BadPaddingException e) {
             e.printStackTrace();
+            throw new RuntimeException(e);
         }
-        return null;
     }
 
-    static Cipher createTheCipherInstance(int p_75886_0_, String transformation, Key key) {
+    static Cipher createTheCipherInstance(int opMode, String transformation, Key key) {
         try {
             Cipher cipher = Cipher.getInstance(transformation);
-            cipher.init(p_75886_0_, key);
+            cipher.init(opMode, key);
             return cipher;
         } catch (InvalidKeyException | NoSuchAlgorithmException | NoSuchPaddingException e) {
             e.printStackTrace();
+            throw new RuntimeException(e);
         }
-        return null;
     }
 
     public static Cipher createNetCipherInstance(int opMode, Key key) {
diff --git a/src/main/java/de/bixilon/minosoft/protocol/protocol/PacketHandler.java b/src/main/java/de/bixilon/minosoft/protocol/protocol/PacketHandler.java
index 4d342d894..a50bcb929 100644
--- a/src/main/java/de/bixilon/minosoft/protocol/protocol/PacketHandler.java
+++ b/src/main/java/de/bixilon/minosoft/protocol/protocol/PacketHandler.java
@@ -65,7 +65,10 @@ public class PacketHandler {
 
         // now we know the version, set it, if the config allows it
         Version version;
-        int protocolId = connection.getDesiredVersionNumber();
+        int protocolId = -1;
+        if (connection.getDesiredVersionNumber() != -1) {
+            protocolId = Versions.getVersionById(connection.getDesiredVersionNumber()).getProtocolId();
+        }
         if (protocolId == -1) {
             protocolId = pkg.getResponse().getProtocolId();
         }