diff --git a/src/main/java/cc/baka9/catseedlogin/bukkit/database/MySQL.java b/src/main/java/cc/baka9/catseedlogin/bukkit/database/MySQL.java
index 88f6c79..6140707 100644
--- a/src/main/java/cc/baka9/catseedlogin/bukkit/database/MySQL.java
+++ b/src/main/java/cc/baka9/catseedlogin/bukkit/database/MySQL.java
@@ -16,7 +16,7 @@ public MySQL(JavaPlugin javaPlugin) {
     }
 
     @Override
-    public Connection getConnection() throws SQLException {
+    public synchronized Connection getConnection() throws SQLException {
         if (isConnectionValid()) {
             return this.connection;
         }
diff --git a/src/main/java/cc/baka9/catseedlogin/bukkit/database/SQLite.java b/src/main/java/cc/baka9/catseedlogin/bukkit/database/SQLite.java
index f225651..9a61c3e 100644
--- a/src/main/java/cc/baka9/catseedlogin/bukkit/database/SQLite.java
+++ b/src/main/java/cc/baka9/catseedlogin/bukkit/database/SQLite.java
@@ -14,24 +14,35 @@ public SQLite(JavaPlugin javaPlugin) {
     }
 
     @Override
-    public Connection getConnection() {
-        try {
-            if (connection == null || connection.isClosed()) {
-                connection = createConnection();
-            }
-            return connection;
-        } catch (SQLException e) {
-            return null;
+    public synchronized Connection getConnection() throws SQLException {
+        if (connection == null || connection.isClosed()) {
+            connection = createConnection();
         }
+        return connection;
     }
 
     private Connection createConnection() throws SQLException {
         try {
-            if (!plugin.getDataFolder().exists()) plugin.getDataFolder().mkdir();
+            ensureDataFolderExists();
             Class.forName("org.sqlite.JDBC");
             return DriverManager.getConnection("jdbc:sqlite:" + plugin.getDataFolder().getAbsolutePath() + "/accounts.db");
         } catch (ClassNotFoundException e) {
             throw new SQLException(e);
         }
     }
+
+    private void ensureDataFolderExists() {
+        if (!plugin.getDataFolder().exists()) {
+            plugin.getDataFolder().mkdir();
+        }
+    }
+
+    public void closeConnection() {
+        try {
+            if (connection != null && !connection.isClosed()) {
+                connection.close();
+            }
+        } catch (SQLException e) {
+        }
+    }
 }
diff --git a/src/main/java/cc/baka9/catseedlogin/bukkit/object/LoginPlayerHelper.java b/src/main/java/cc/baka9/catseedlogin/bukkit/object/LoginPlayerHelper.java
index 6f3421c..ff2ac76 100644
--- a/src/main/java/cc/baka9/catseedlogin/bukkit/object/LoginPlayerHelper.java
+++ b/src/main/java/cc/baka9/catseedlogin/bukkit/object/LoginPlayerHelper.java
@@ -1,5 +1,7 @@
 package cc.baka9.catseedlogin.bukkit.object;
 
+import java.net.InetAddress;
+import java.net.UnknownHostException;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.HashSet;
@@ -102,7 +104,12 @@ public static boolean recordCurrentIP(Player player) {
         List<String> storedIPs = getStoredIPs(storedPlayer);
         Long exitTime = playerExitTimes.get(playerName);
 
-        if (currentIP.equals("127.0.0.1")) {
+        try {
+            InetAddress localHost = InetAddress.getByName("localhost");
+            if (InetAddress.getByName(currentIP).equals(localHost)) {
+                return false;
+            }
+        } catch (UnknownHostException e) {
             return false;
         }