From 411ebbe2d7bd814425c6876864657aadeb23aa61 Mon Sep 17 00:00:00 2001
From: Matias Alejo Garcia <ematiu@gmail.com>
Date: Mon, 18 Aug 2014 17:45:54 -0400
Subject: [PATCH] fix type

---
 js/models/core/Wallet.js | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/js/models/core/Wallet.js b/js/models/core/Wallet.js
index 303c06d67..545ae4b55 100644
--- a/js/models/core/Wallet.js
+++ b/js/models/core/Wallet.js
@@ -1625,9 +1625,11 @@ Wallet.prototype.updateIndex = function(index, callback) {
   });
 }
 
-Wallet.prototype.deriveAddresses = function(index, amout, isChange, cosigner) {
-  var ret = new Array(amout);
-  for (var i = 0; i < amout; i++) {
+Wallet.prototype.deriveAddresses = function(index, amount, isChange, cosigner) {
+  preconditions.checkArgument(cosigner);
+
+  var ret = new Array(amount);
+  for (var i = 0; i < amount; i++) {
     ret[i] = this.publicKeyRing.getAddress(index + i, isChange, cosigner).toString();
   }
   return ret;