diff --git a/lib/6to5/transformation/transformers/es6-let-scoping.js b/lib/6to5/transformation/transformers/es6-let-scoping.js
index 40aa3b3a73..9c7d0aeb16 100644
--- a/lib/6to5/transformation/transformers/es6-let-scoping.js
+++ b/lib/6to5/transformation/transformers/es6-let-scoping.js
@@ -231,10 +231,9 @@ LetScoping.prototype.getInfo = function () {
     }
   };
 
-  var i;
   var declar;
 
-  for (i in opts.declarators) {
+  for (var i in opts.declarators) {
     declar = opts.declarators[i];
     opts.declarators.push(declar);
 
@@ -246,14 +245,16 @@ LetScoping.prototype.getInfo = function () {
     opts.keys = opts.keys.concat(keys);
   }
 
-  for (i = 0; i < block.body.length; i++) {
-    declar = block.body[i];
-    if (!isLet(declar, block)) continue;
+  if (block.body) {
+    for (i = 0; i < block.body.length; i++) {
+      declar = block.body[i];
+      if (!isLet(declar, block)) continue;
 
-    var declars = t.getIds(declar, true);
-    for (var key in declars) {
-      duplicates(declars[key], key);
-      opts.keys.push(key);
+      var declars = t.getIds(declar, true);
+      for (var key in declars) {
+        duplicates(declars[key], key);
+        opts.keys.push(key);
+      }
     }
   }