diff --git a/lib/6to5/transformation/transformers/let-scoping.js b/lib/6to5/transformation/transformers/let-scoping.js
index 7998e9e362..6741207e7e 100644
--- a/lib/6to5/transformation/transformers/let-scoping.js
+++ b/lib/6to5/transformation/transformers/let-scoping.js
@@ -260,7 +260,7 @@ LetScoping.prototype.checkFor = function () {
       return false;
     }
 
-    if (forParent && !node.label) {
+    if (forParent && node && !node.label) {
       if (t.isBreakStatement(node)) {
         has.hasBreak = true;
         replace = t.returnStatement(t.literal("break"));