From 1a5030200ad190809955d8bfc9006699f9165c5b Mon Sep 17 00:00:00 2001
From: Alex Bilbie <alexbilbie@Alexs-Home-iMac.local>
Date: Fri, 12 Feb 2016 14:18:45 +0000
Subject: [PATCH] The response may be a PSR response which is valid

---
 src/Server.php | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/Server.php b/src/Server.php
index 52605297..c7639db3 100644
--- a/src/Server.php
+++ b/src/Server.php
@@ -137,7 +137,11 @@ class Server implements EmitterAwareInterface
             }
         }
 
-        if (!$tokenResponse instanceof ResponseTypeInterface) {
+        if ($tokenResponse instanceof ResponseInterface) {
+            return $tokenResponse;
+        }
+
+        if ($tokenResponse instanceof ResponseTypeInterface === false) {
             return OAuthServerException::unsupportedGrantType()->generateHttpResponse($response);
         }