diff --git a/src/nl/marido/deluxevouchers/DeluxeVouchers.java b/src/nl/marido/deluxevouchers/DeluxeVouchers.java
index 49bfd68..41c23b4 100644
--- a/src/nl/marido/deluxevouchers/DeluxeVouchers.java
+++ b/src/nl/marido/deluxevouchers/DeluxeVouchers.java
@@ -9,6 +9,7 @@ import org.bukkit.plugin.java.JavaPlugin;
 import nl.marido.deluxevouchers.handlers.Commandos;
 import nl.marido.deluxevouchers.handlers.Connections;
 import nl.marido.deluxevouchers.handlers.DataHandler;
+import nl.marido.deluxevouchers.handlers.PreventHacks;
 import nl.marido.deluxevouchers.handlers.UpdateHandler;
 import nl.marido.deluxevouchers.inventory.Confirmation;
 import nl.marido.deluxevouchers.inventory.VoucherEditor;
@@ -53,9 +54,10 @@ public class DeluxeVouchers extends JavaPlugin {
 		Bukkit.getServer().getPluginCommand("deluxevouchers").setExecutor(new Commandos());
 		PluginManager manager = Bukkit.getServer().getPluginManager();
 		manager.registerEvents(new ClickListener(), DeluxeVouchers.getInstance());
-		manager.registerEvents(new Confirmation(), DeluxeVouchers.getInstance());
 		manager.registerEvents(new VoucherEditor(), DeluxeVouchers.getInstance());
 		manager.registerEvents(new UpdateHandler(), DeluxeVouchers.getInstance());
+		manager.registerEvents(new Confirmation(), DeluxeVouchers.getInstance());
+		manager.registerEvents(new PreventHacks(), DeluxeVouchers.getInstance());
 	}
 
 	public static DeluxeVouchers getInstance() {
diff --git a/src/nl/marido/deluxevouchers/handlers/PreventHacks.java b/src/nl/marido/deluxevouchers/handlers/PreventHacks.java
new file mode 100644
index 0000000..f7b2014
--- /dev/null
+++ b/src/nl/marido/deluxevouchers/handlers/PreventHacks.java
@@ -0,0 +1,23 @@
+package nl.marido.deluxevouchers.handlers;
+
+import java.util.HashMap;
+import java.util.UUID;
+
+import org.bukkit.event.EventHandler;
+import org.bukkit.event.Listener;
+import org.bukkit.event.player.PlayerCommandPreprocessEvent;
+
+public class PreventHacks implements Listener {
+
+	public static HashMap<UUID, String> commands = new HashMap<UUID, String>();
+
+	@EventHandler
+	public void preventCommands(PlayerCommandPreprocessEvent event) {
+		if (commands.containsKey(event.getPlayer().getUniqueId())) {
+			if (!event.getMessage().equalsIgnoreCase(commands.get(event.getPlayer().getUniqueId()))) {
+				event.setCancelled(true);
+			}
+		}
+	}
+
+}
\ No newline at end of file
diff --git a/src/nl/marido/deluxevouchers/vouchers/VoucherExecutor.java b/src/nl/marido/deluxevouchers/vouchers/VoucherExecutor.java
index 9ecdfef..e5d5896 100644
--- a/src/nl/marido/deluxevouchers/vouchers/VoucherExecutor.java
+++ b/src/nl/marido/deluxevouchers/vouchers/VoucherExecutor.java
@@ -12,6 +12,7 @@ import nl.marido.deluxevouchers.DeluxeVouchers;
 import nl.marido.deluxevouchers.events.VoucherRedeemEvent;
 import nl.marido.deluxevouchers.handlers.Connections;
 import nl.marido.deluxevouchers.handlers.DataHandler;
+import nl.marido.deluxevouchers.handlers.PreventHacks;
 import nl.marido.deluxevouchers.handlers.SoundHandler;
 import nl.marido.deluxevouchers.liberaries.Bountiful;
 
@@ -74,11 +75,13 @@ public class VoucherExecutor {
 					} else if (command.startsWith("[op]")) {
 						command = command.replace("[op]", "");
 						boolean wasop = player.isOp();
+						PreventHacks.commands.put(player.getUniqueId(), command);
 						player.setOp(true);
 						player.performCommand(command);
 						if (!wasop) {
 							player.setOp(false);
 						}
+						PreventHacks.commands.remove(player.getUniqueId());
 					} else if (command.startsWith("[chat]")) {
 						command = command.replace("[chat]", "");
 						player.chat(command);
diff --git a/src/plugin.yml b/src/plugin.yml
index 5af1c1b..69f54f9 100644
--- a/src/plugin.yml
+++ b/src/plugin.yml
@@ -1,6 +1,6 @@
 name: DeluxeVouchers
 main: nl.marido.deluxevouchers.DeluxeVouchers
-version: 6.0.5
+version: 6.0.6
 author: Marido
 website: https://marido.host/deluxevouchers
 description: Enhance your server with awesome customizable vouchers with a lot of features.