From 036651050daf66f6c76c98725139f5597fb3a948 Mon Sep 17 00:00:00 2001
From: zepumph <michael.kauzmann@colorado.edu>
Date: Tue, 3 Oct 2017 13:15:15 -0800
Subject: [PATCH] added TBAAGameChallenge to serialize challenge model state,
 https://github.com/phetsims/build-an-atom/issues/156

---
 js/types/TArray.js | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/js/types/TArray.js b/js/types/TArray.js
index 86123415..9856469a 100644
--- a/js/types/TArray.js
+++ b/js/types/TArray.js
@@ -55,6 +55,8 @@ define( function( require ) {
        * @returns {Array}
        */
       toStateObject: function( array ) {
+        assert && assert( elementType.toStateObject, elementType.typeName + ' does not have a toStateObject method.');
+
         var json = [];
         for ( var i = 0; i < array.length; i++ ) {
           json.push( elementType.toStateObject( array[ i ] ) );