diff --git a/src/net/mc_pandacraft/java/plugin/pandacraftutils/players/OnlinePlayerManager.java b/src/net/mc_pandacraft/java/plugin/pandacraftutils/players/OnlinePlayerManager.java
index ce80d16..0dbcec6 100644
--- a/src/net/mc_pandacraft/java/plugin/pandacraftutils/players/OnlinePlayerManager.java
+++ b/src/net/mc_pandacraft/java/plugin/pandacraftutils/players/OnlinePlayerManager.java
@@ -53,13 +53,13 @@ public final class OnlinePlayerManager {
 	// ----------------------------------------
 	// -------------- Evènements --------------
 	// ----------------------------------------
-	public void onPlayerJoin (PlayerJoinEvent event)
+	public synchronized void onPlayerJoin (PlayerJoinEvent event)
 	{
 		players.put(event.getPlayer(), new OnlinePlayer(event.getPlayer()));
 	}
 
 	
-	public void onPlayerQuit (PlayerQuitEvent event)
+	public synchronized void onPlayerQuit (PlayerQuitEvent event)
 	{
 		players.remove(event.getPlayer());
 	}
@@ -74,16 +74,16 @@ public final class OnlinePlayerManager {
 	
 	
 	
-	public static OnlinePlayer get(Player p) {
+	public synchronized static OnlinePlayer get(Player p) {
 		return getInstance().players.get(p);
 	}
 	
-	public static Collection<OnlinePlayer> getAll() {
+	public synchronized static Collection<OnlinePlayer> getAll() {
 		return new ArrayList<OnlinePlayer>(getInstance().players.values());
 	}
 	
 	
-	public static boolean isOnline(Player p) {
+	public synchronized static boolean isOnline(Player p) {
 		return getInstance().players.containsKey(p);
 	}