diff --git a/README b/README
index 29a7381..4d10509 100644
--- a/README
+++ b/README
@@ -126,6 +126,13 @@ toowner - Whether the money from gate-use goes to the owner or nobody
 =============
   Changes
 =============
+[Version 0.4.2]
+ - Gates can't be created on existing gate blocks
+[Version 0.4.1]
+ - Sign option permissions
+ - Per-gate iconomy target
+ - /sg reload command
+ - Other misc fixes
 [Version 0.4.0]
  - Carts with no player can now go through gates.
  - You can set gates to send their cost to their owner.
diff --git a/src/net/TheDgtl/Stargate/Portal.java b/src/net/TheDgtl/Stargate/Portal.java
index 2ac991e..12592bb 100644
--- a/src/net/TheDgtl/Stargate/Portal.java
+++ b/src/net/TheDgtl/Stargate/Portal.java
@@ -556,6 +556,7 @@ public class Portal {
 		Block idParent = id.getParent();
 		if (idParent == null) return null;
 		if (Gate.getGatesByControlBlock(idParent).length == 0) return null;
+		if (Portal.getByBlock(idParent) != null) return null;
 
 		Blox parent = new Blox(player.getWorld(), idParent.getX(), idParent.getY(), idParent.getZ());
 		Blox topleft = null;
@@ -650,6 +651,12 @@ public class Portal {
 			return null;
 		}
 		
+		// Bleh, gotta check to make sure none of this gate belongs to another gate. Boo slow.
+		for (RelativeBlockVector v : gate.getBorder()) {
+			Blox b = topleft.modRelative(v.getRight(), v.getDepth(), v.getDistance(), modX, 1, modZ);
+			if (Portal.getByBlock(b.getBlock()) != null) return null;
+		}
+		
 		if (iConomyHandler.useiConomy() && !Stargate.hasPerm(player, "stargate.free.create", player.isOp())) {
 			if (!iConomyHandler.chargePlayer(player.getName(), null, gate.getCreateCost())) {
 				if (!iConomyHandler.inFundMsg.isEmpty()) {
diff --git a/src/plugin.yml b/src/plugin.yml
index 733c907..08f993c 100644
--- a/src/plugin.yml
+++ b/src/plugin.yml
@@ -1,6 +1,6 @@
 name: Stargate
 main: net.TheDgtl.Stargate.Stargate
-version: 0.4.1
+version: 0.4.2
 description: Stargate mod for Bukkit
 author: Drakia
 website: http://www.thedgtl.net