diff --git a/src/main/java/fr/xephi/authme/Utils.java b/src/main/java/fr/xephi/authme/Utils.java
index 7ba328b6..645e7faf 100644
--- a/src/main/java/fr/xephi/authme/Utils.java
+++ b/src/main/java/fr/xephi/authme/Utils.java
@@ -12,7 +12,9 @@ import org.bukkit.entity.Entity;
 import org.bukkit.entity.Player;
 
 import java.io.File;
+import java.io.IOException;
 import java.lang.reflect.Method;
+import java.nio.file.Files;
 import java.util.Arrays;
 import java.util.Collection;
 import java.util.Collections;
@@ -180,16 +182,19 @@ public class Utils {
     }
 
     public static void purgeDirectory(File file) {
-        String files[] = file.list();
-        if (files != null && files.length != 0) {
-            for (String temp : files) {
-                File fileDelete = new File(file, temp);
-                if (fileDelete.isDirectory()) {
-                    purgeDirectory(fileDelete);
-                    fileDelete.delete();
-                } else {
-                    fileDelete.delete();
-                }
+        if (!file.isDirectory()) {
+            return;
+        }
+        File[] files = file.listFiles();
+        if (files == null) {
+            return;
+        }
+        for (File target : files) {
+            if(target.isDirectory()) {
+                purgeDirectory(target);
+                target.delete();
+            } else {
+                target.delete();
             }
         }
     }
diff --git a/src/main/java/fr/xephi/authme/security/crypts/PHPBB.java b/src/main/java/fr/xephi/authme/security/crypts/PHPBB.java
index e5c666b6..cc5d4dc3 100644
--- a/src/main/java/fr/xephi/authme/security/crypts/PHPBB.java
+++ b/src/main/java/fr/xephi/authme/security/crypts/PHPBB.java
@@ -50,24 +50,24 @@ public class PHPBB implements EncryptionMethod {
      * Encode hash
      */
     private String _hash_encode64(String input, int count) {
-        String output = "";
+        StringBuilder output = new StringBuilder();
         int i = 0;
         do {
             int value = input.charAt(i++);
-            output += itoa64.charAt(value & 0x3f);
+            output.append(itoa64.charAt(value & 0x3f));
             if (i < count)
                 value |= input.charAt(i) << 8;
-            output += itoa64.charAt((value >> 6) & 0x3f);
+            output.append(itoa64.charAt((value >> 6) & 0x3f));
             if (i++ >= count)
                 break;
             if (i < count)
                 value |= input.charAt(i) << 16;
-            output += itoa64.charAt((value >> 12) & 0x3f);
+            output.append(itoa64.charAt((value >> 12) & 0x3f));
             if (i++ >= count)
                 break;
-            output += itoa64.charAt((value >> 18) & 0x3f);
+            output.append(itoa64.charAt((value >> 18) & 0x3f));
         } while (i < count);
-        return output;
+        return output.toString();
     }
 
     String _hash_crypt_private(String password, String setting) {