diff --git a/lib/PandacraftAuth.jar b/lib/PandacraftAuth.jar
index 14b14d3..7231142 100644
Binary files a/lib/PandacraftAuth.jar and b/lib/PandacraftAuth.jar differ
diff --git a/src/net/mc_pandacraft/java/plugin/pandacraftutils/commands/CommandStaff.java b/src/net/mc_pandacraft/java/plugin/pandacraftutils/commands/CommandStaff.java
index f7fab8a..231ec6a 100644
--- a/src/net/mc_pandacraft/java/plugin/pandacraftutils/commands/CommandStaff.java
+++ b/src/net/mc_pandacraft/java/plugin/pandacraftutils/commands/CommandStaff.java
@@ -152,11 +152,17 @@ public class CommandStaff extends AbstractCommandExecutor {
 				}
 				else {
 					// le joueur n'est pas en ligne
-					((Player)sender).teleport(wp.getLocation());
-					
 					sender.sendMessage(ChatColor.GREEN+"-----------------------------------------------");
 					displayTicket(sender, wp, true);
-					sender.sendMessage(ChatColor.GREEN+"Vous avez été téléporté vers l'endroit concerné par la demande du joueur");
+					
+					if (wp.getLocation().getWorld() == null) {
+						sender.sendMessage(ChatColor.GREEN+"Le monde vers lequel vous deviez vous téléporter est introuvable ou invalide");
+					}
+					else {
+						((Player)sender).teleport(wp.getLocation());
+						sender.sendMessage(ChatColor.GREEN+"Vous avez été téléporté vers l'endroit concerné par la demande du joueur");
+					}
+					
 					sender.sendMessage(ChatColor.GREEN+"-----------------------------------------------");
 				}
 				
diff --git a/src/net/mc_pandacraft/java/plugin/pandacraftutils/config/WorldBorderConfig.java b/src/net/mc_pandacraft/java/plugin/pandacraftutils/config/WorldBorderConfig.java
index c5a33c2..f653931 100644
--- a/src/net/mc_pandacraft/java/plugin/pandacraftutils/config/WorldBorderConfig.java
+++ b/src/net/mc_pandacraft/java/plugin/pandacraftutils/config/WorldBorderConfig.java
@@ -59,6 +59,7 @@ public class WorldBorderConfig extends AbstractConfig {
 	}
 	
 	public WorldBorderConfigEntry getEntry(World world) {
+		if (world == null) return null;
 		return getEntry(world.getName());
 	}
 	
diff --git a/src/net/mc_pandacraft/java/plugin/pandacraftutils/modules/protection/NoPvpProtectManager.java b/src/net/mc_pandacraft/java/plugin/pandacraftutils/modules/protection/NoPvpProtectManager.java
index 79f156a..da2e5e0 100644
--- a/src/net/mc_pandacraft/java/plugin/pandacraftutils/modules/protection/NoPvpProtectManager.java
+++ b/src/net/mc_pandacraft/java/plugin/pandacraftutils/modules/protection/NoPvpProtectManager.java
@@ -250,7 +250,7 @@ public class NoPvpProtectManager {
         for (Player pl : pls)
         {
         	// on ignore ceux en créatif
-        	if (pl == null || !pl.isOnline() || pl.getGameMode() == GameMode.CREATIVE)
+        	if (pl == null || !pl.isOnline() || OnlinePlayerManager.get(pl) == null || pl.getGameMode() == GameMode.CREATIVE)
         		continue;
         	
         	if (OnlinePlayerManager.get(pl).isVanished())