From 8d0c224992330592feac27c6f9be747ec33f5b3a Mon Sep 17 00:00:00 2001
From: Dave Longley <dlongley@digitalbazaar.com>
Date: Tue, 9 Apr 2013 11:34:31 -0400
Subject: [PATCH] Throw error if compaction context is null.

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

diff --git a/jsonld.php b/jsonld.php
index 53b18cc..db87931 100644
--- a/jsonld.php
+++ b/jsonld.php
@@ -612,6 +612,12 @@ class JsonLdProcessor {
    * @return mixed the compacted JSON-LD output.
    */
   public function compact($input, $ctx, $options) {
+    if($ctx === null) {
+      throw new JsonLdException(
+        'The compaction context must not be null.',
+        'jsonld.CompactError');
+    }
+
     // nothing to compact
     if($input === null) {
       return null;