From 5847cbacb5f5f8a59bff280fa69c032bb3571b0d Mon Sep 17 00:00:00 2001
From: Michael Kruglos <michael@kruglos.com>
Date: Tue, 7 Mar 2017 00:56:44 +0200
Subject: [PATCH] Fix for crash given schema {"enum":[null]}

---
 src/core.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/core.js b/src/core.js
index b98241638..27ef6581a 100644
--- a/src/core.js
+++ b/src/core.js
@@ -348,7 +348,7 @@ JSONEditor.prototype = {
       if(!schema.hasOwnProperty(i)) continue;
       if(schema[i] && typeof schema[i] === "object" && Array.isArray(schema[i])) {
         for(var j=0; j<schema[i].length; j++) {
-          if(typeof schema[i][j]==="object") {
+          if(schema[i][j] && typeof schema[i][j]==="object") {
             merge_refs(this._getExternalRefs(schema[i][j]));
           }
         }