diff --git a/node_modules/json-order/dist/parse.js b/node_modules/json-order/dist/parse.js
index 7d4aad8..8eda055 100644
--- a/node_modules/json-order/dist/parse.js
+++ b/node_modules/json-order/dist/parse.js
@@ -12,7 +12,7 @@ var traverseObject = function (obj, map, parentKey, separator) {
     }
     childKeys.forEach(function (childKey) {
         var value = obj[childKey];
-        if (typeof value === 'object') {
+        if (value !== null && typeof value === 'object') {
             traverseObject(value, map, "" + parentKey + separator + childKey, separator);
         }
     });