minor

1 files changed, 2 insertions, 2 deletions

diff --git a/lib/ast.js b/lib/ast.js
index 3e6e1771..0b0273c8 100644
--- a/lib/ast.js
+++ b/lib/ast.js
@@ -698,9 +698,9 @@ function TreeWalker(callback) {
 TreeWalker.prototype = {
     _visit: function(node, descend) {
         this.stack.push(node);
-        var ret = this.visit(node, function(){
+        var ret = this.visit(node, descend ? function(){
             descend.call(node);
-        });
+        } : noop);
         if (!ret && descend) {
             descend.call(node);
         }