diff --git a/src/ErrorHandler.php b/src/ErrorHandler.php
index 4ba8f20..2288cc5 100644
--- a/src/ErrorHandler.php
+++ b/src/ErrorHandler.php
@@ -4,8 +4,8 @@
 
 use Buzz\Exception\ClientException;
 use Jobcloud\Kafka\SchemaRegistryClient\Exception\BackendDatastoreException;
-use Jobcloud\Kafka\SchemaRegistryClient\Exception\ImportException;
 use Jobcloud\Kafka\SchemaRegistryClient\Exception\CompatibilityException;
+use Jobcloud\Kafka\SchemaRegistryClient\Exception\ImportException;
 use Jobcloud\Kafka\SchemaRegistryClient\Exception\IncompatibileAvroSchemaException;
 use Jobcloud\Kafka\SchemaRegistryClient\Exception\InvalidAvroSchemaException;
 use Jobcloud\Kafka\SchemaRegistryClient\Exception\InvalidVersionException;
@@ -18,10 +18,10 @@
 use Jobcloud\Kafka\SchemaRegistryClient\Exception\UnauthorizedException;
 use Jobcloud\Kafka\SchemaRegistryClient\Exception\UnprocessableEntityException;
 use Jobcloud\Kafka\SchemaRegistryClient\Exception\VersionNotFoundException;
+use JsonException;
 use Psr\Http\Client\ClientExceptionInterface;
 use Psr\Http\Message\RequestInterface;
 use Psr\Http\Message\ResponseInterface;
-use JsonException;
 
 class ErrorHandler implements ErrorHandlerInterface
 {
@@ -45,8 +45,11 @@ class ErrorHandler implements ErrorHandlerInterface
      * @throws ClientExceptionInterface
      * @throws SchemaRegistryExceptionInterface
      */
-    public function handleError(ResponseInterface $response, string $uri = null, RequestInterface $request = null): void
-    {
+    public function handleError(
+        ResponseInterface $response,
+        ?string $uri = null,
+        ?RequestInterface $request = null
+    ): void {
         $responseContent = json_decode($response->getBody(), true, 512, JSON_THROW_ON_ERROR);
 
         if (false === isset($responseContent['error_code'])) {
diff --git a/src/ErrorHandlerInterface.php b/src/ErrorHandlerInterface.php
index fa22e2b..dc02acf 100644
--- a/src/ErrorHandlerInterface.php
+++ b/src/ErrorHandlerInterface.php
@@ -17,7 +17,7 @@ interface ErrorHandlerInterface
      */
     public function handleError(
         ResponseInterface $response,
-        string $uri = null,
-        RequestInterface $request = null
+        ?string $uri = null,
+        ?RequestInterface $request = null
     ): void;
 }