From a29ea93ffdbe6e77eb7f7847ce08a06734fcdd76 Mon Sep 17 00:00:00 2001
From: Dave Longley <dlongley@digitalbazaar.com>
Date: Fri, 29 Jul 2011 16:17:51 -0400
Subject: [PATCH] Passed nulls test.

---
 jsonld.php | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/jsonld.php b/jsonld.php
index b69ef34..faaa267 100644
--- a/jsonld.php
+++ b/jsonld.php
@@ -1314,7 +1314,11 @@ function _flatten($parent, $parentProperty, $value, $subjects)
 {
    $flattened = null;
 
-   if(is_array($value))
+   if($value === null)
+   {
+      // drop null values
+   }
+   else if(is_array($value))
    {
       // list of objects or a disjoint graph
       foreach($value as $v)