2 files changed, 7 insertions, 3 deletions
diff --git a/src/jcgp/backend/population/Node.java b/src/jcgp/backend/population/Node.java
index 6a558a4..b716ff8 100644
--- a/src/jcgp/backend/population/Node.java
+++ b/src/jcgp/backend/population/Node.java
@@ -31,8 +31,12 @@ public class Node extends Gene implements MutableElement, Connection {
 
 	@Override
 	public void setConnection(int index, Connection newConnection) {
-		connections[index] = newConnection;
-		chromosome.recomputeActiveNodes();
+		if (newConnection instanceof Node) {
+			if (((Node) newConnection).getColumn() < column) {
+				connections[index] = newConnection;
+				chromosome.recomputeActiveNodes();
+			}
+		}
 	}
 
 	public void initialise(Function newFunction, Connection ... newConnections) throws InsufficientConnectionsException {
diff --git a/src/jcgp/backend/population/Population.java b/src/jcgp/backend/population/Population.java
index 1bbdc54..b6dd055 100644
--- a/src/jcgp/backend/population/Population.java
+++ b/src/jcgp/backend/population/Population.java
@@ -4,7 +4,7 @@ import jcgp.backend.resources.Resources;
 
 public class Population {
 	
-	private Chromosome[] chromosomes;
+	private final Chromosome[] chromosomes;
 	private final Resources resources;
 	private int fittest = 0;