diff --git a/PlotSquared/src/com/intellectualcrafters/plot/Plot.java b/PlotSquared/src/com/intellectualcrafters/plot/Plot.java
index 3e5825735..47d064cb6 100644
--- a/PlotSquared/src/com/intellectualcrafters/plot/Plot.java
+++ b/PlotSquared/src/com/intellectualcrafters/plot/Plot.java
@@ -219,7 +219,9 @@ public class Plot implements Cloneable {
 	 * @param uuid
 	 */
 	public void addDenied(UUID uuid) {
-		this.denied.add(uuid);
+		if (!denied.contains(uuid)) {
+			this.denied.add(uuid);
+		}
 	}
 
 	/**
@@ -228,7 +230,9 @@ public class Plot implements Cloneable {
 	 * @param uuid
 	 */
 	public void addHelper(UUID uuid) {
-		this.helpers.add(uuid);
+		if (!helpers.contains(uuid)) {
+			this.helpers.add(uuid);
+		}
 	}
 
 	/**
@@ -237,7 +241,9 @@ public class Plot implements Cloneable {
 	 * @param uuid
 	 */
 	public void addTrusted(UUID uuid) {
-		this.trusted.add(uuid);
+		if (!trusted.contains(uuid)) {
+			this.trusted.add(uuid);
+		}
 	}
 
 	/**