Minor change

classes/TokenBuilder.php

@@ -98,7 +98,7 @@ class TokenBuilder {
         if ($client->scopeAudienceMap !== null) {
             foreach ($tokenData->scope as $scope) {
                 if (array_key_exists($scope, $client->scopeAudienceMap)) {
-                    $audience = $client->scopeAudienceMap[$scope];
+                    $audience = ((array) $client->scopeAudienceMap)[$scope];
                     if (!in_array($audience, $audiences)) {
                         array_push($audiences, $audience);
                     }