Minor change

        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);

                    }