From 7767450b1a71a6d99e777a4ae8014f300db3cbfe Mon Sep 17 00:00:00 2001
From: BYUDigger <skyler.murray@outlook.com>
Date: Mon, 17 Oct 2016 16:41:04 -0700
Subject: [PATCH] Add null checks to addEventLIstener

Ran into this at work where callback was undefined. Adding in a check for the case when they are null.
---
 spongeapi.js | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/spongeapi.js b/spongeapi.js
index 4d64526..e46a1f6 100644
--- a/spongeapi.js
+++ b/spongeapi.js
@@ -312,8 +312,10 @@ handleSetupResponse = function(message) {
   spongeapi.initComplete = true;
 }
 window.addEventListener('message', function(event) {
-  var message = event.data;
-  if (message) {
-  eval(message.callback)(message.data);
+  if (event){
+    var message = event.data;
+    if (message && message.callback) {
+      eval(message.callback)(message.data);
+    }
   }
-});
\ No newline at end of file
+});