diff --git a/src/sa/SaDepthFirstVisitor.java b/src/sa/SaDepthFirstVisitor.java
index ded93ad194c4d1bc1f81c6f76a48c900262ce527..54796e8b2f557306d03078f5d1afe42674a77595 100644
--- a/src/sa/SaDepthFirstVisitor.java
+++ b/src/sa/SaDepthFirstVisitor.java
@@ -340,7 +340,10 @@ public class SaDepthFirstVisitor <T> implements SaVisitor <T>{
     public T visit(SaInstBloc node) throws Exception
     {
 	defaultIn(node);
-	node.getVal().accept(this);
+	if ( node.getVal() != null )
+	    {
+		node.getVal().accept(this);
+	    }
 	defaultOut(node);
 	return null;
     }