JavaScriptCollection
diff --git a/‎d3.layout.js‎
Lines changed: 1 addition & 1 deletion b/‎d3.layout.js‎
Lines changed: 1 addition & 1 deletion
@@ -1486,7 +1486,7 @@ d3.layout.tree = function() {
     function firstWalk(node, previousSibling) {
       var children = node.children,
           layout = node._tree;
-      if (children) {
+      if (children && children.length) {
         var n = children.length,
             firstChild = children[0],
             previousChild,