return unmodified response on error

Author: ylebre

src/TokenGenerator.php

@@ -187,7 +187,10 @@ public function addIdTokenToResponse($response, $clientId, $subject, $nonce, $pr
             $responseBody = $response->getBody()->getContents();
             try {
                 $body = json_decode($responseBody, true);
-
+                if (isset($body['error'])) {
+                    return $response;
+                }
+                    
                 $accessToken = $this->generateAccessToken($clientId, $subject);
                 $accessToken = $this->bindDpop($dpop, $accessToken);
                 $accessToken = $this->signToken($accessToken);