diff --git a/src/Exceptions/ServiceUnavailable.php b/src/Exceptions/ServiceUnavailable.php
index 87f170a..339874c 100644
--- a/src/Exceptions/ServiceUnavailable.php
+++ b/src/Exceptions/ServiceUnavailable.php
@@ -2,7 +2,9 @@
 
 namespace h4kuna\Fio\Exceptions;
 
-class ServiceUnavailable extends \RuntimeException
+use Psr\Http\Client\ClientExceptionInterface;
+
+class ServiceUnavailable extends \RuntimeException implements ClientExceptionInterface
 {
 
 }
diff --git a/src/Utils/Queue.php b/src/Utils/Queue.php
index 93bf8ce..383676c 100644
--- a/src/Utils/Queue.php
+++ b/src/Utils/Queue.php
@@ -104,7 +104,7 @@ private function request(string $token, RequestInterface $request): ResponseInte
 			return $response;
 		} catch (ClientExceptionInterface $e) {
 			$message = str_replace($token, Strings::truncate($token, 10), $e->getMessage());
-			throw new Exceptions\ServiceUnavailable($message, $e->getCode(), $e);
+			throw new Exceptions\ServiceUnavailable($message, $e->getCode()); // in url is token, don't need keep previous exception
 		} finally {
 			fclose($file);
 		}