From eb4b344049809822f8e1dfafc1c25d1a8d55a1f3 Mon Sep 17 00:00:00 2001
From: Dave Longley <dlongley@digitalbazaar.com>
Date: Mon, 14 Sep 2015 09:39:23 -0400
Subject: [PATCH] Ignore null values in language maps.

The syntax spec explicitly allows null values in language maps (section 8.5).
---
 jsonld.php | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/jsonld.php b/jsonld.php
index 7bbe87b..ec7f956 100644
--- a/jsonld.php
+++ b/jsonld.php
@@ -3216,6 +3216,9 @@ class JsonLdProcessor {
       $values = $language_map->{$key};
       $values = self::arrayify($values);
       foreach($values as $item) {
+        if($item === null) {
+          continue;
+        }
         if(!is_string($item)) {
           throw new JsonLdException(
             'Invalid JSON-LD syntax; language map values must be strings.',