diff --git a/index.js b/index.js
index 2586e1c..8dafa00 100755
--- a/index.js
+++ b/index.js
@@ -129,6 +129,9 @@ module.exports.init = function() {
     if (request === undefined) {
       return undefined;
     }
+    else if (request === null) {
+      return null;
+    }
     if (request.constructor === Array) {
       for (var i = 0; i < request.length; i++) {
         request[i] = exports.camelCaseToUnderscoreRequest(request[i]);
@@ -217,7 +220,10 @@ module.exports.init = function() {
   }
 
   exports.normalizeAllMasterPictures = function(request) {
-    if (request.constructor === Array) {
+    if (request === null) {
+      return '';
+    }
+    else if (request.constructor === Array) {
       for (var i = 0; i < request.length; i++) {
         request[i] = exports.normalizeAllMasterPictures(request[i]);
       }
diff --git a/test/test.js b/test/test.js
index b0c4465..4116d34 100755
--- a/test/test.js
+++ b/test/test.js
@@ -259,6 +259,8 @@ describe('RFG Api', function() {
 
       assert.equal(rfg.camelCaseToUnderscoreRequest(undefined), undefined);
 
+      assert.equal(rfg.camelCaseToUnderscoreRequest(null), null);
+
       assert.deepEqual(rfg.camelCaseToUnderscoreRequest({
         firstEntry: 'firstValue',
         secondEntry: [
@@ -401,7 +403,8 @@ describe('Request helpers', function() {
             masterPicture: {
               content: path.join(__dirname, 'input', 'small_file.txt'),
             },
-            pictureAspect: 'noChange'
+            pictureAspect: 'noChange',
+            appName: null
           }
         }
       }),{
@@ -413,7 +416,8 @@ describe('Request helpers', function() {
               content: "U29tZSByYW5kb20gY29udGVudA==",
               type: 'inline'
             },
-            picture_aspect: 'no_change'
+            picture_aspect: 'no_change',
+            app_name: ''
           }
         },
         files_location: {