diff --git a/src/Symfony/Component/Mailer/Bridge/Brevo/RemoteEvent/BrevoPayloadConverter.php b/src/Symfony/Component/Mailer/Bridge/Brevo/RemoteEvent/BrevoPayloadConverter.php
index 8d556b8f37c9a..5f5f0816c23c6 100644
--- a/src/Symfony/Component/Mailer/Bridge/Brevo/RemoteEvent/BrevoPayloadConverter.php
+++ b/src/Symfony/Component/Mailer/Bridge/Brevo/RemoteEvent/BrevoPayloadConverter.php
@@ -60,7 +60,10 @@ public function convert(array $payload): AbstractMailerEvent
 
         $event->setDate($date);
         $event->setRecipientEmail($payload['email']);
-        $event->setTags($payload['tags']);
+
+        if (isset($payload['tags'])) {
+            $event->setTags($payload['tags']);
+        }
 
         return $event;
     }
diff --git a/src/Symfony/Component/Mailer/Bridge/Brevo/Tests/Webhook/Fixtures/request_without_tags.json b/src/Symfony/Component/Mailer/Bridge/Brevo/Tests/Webhook/Fixtures/request_without_tags.json
new file mode 100644
index 0000000000000..4fbeadc58112b
--- /dev/null
+++ b/src/Symfony/Component/Mailer/Bridge/Brevo/Tests/Webhook/Fixtures/request_without_tags.json
@@ -0,0 +1,13 @@
+{
+  "id": 814119,
+  "email": "example@gmail.com",
+  "message-id": "<202305311313.92192897094@smtp-relay.mailin.fr>",
+  "date": "2023-05-31 15:13:08",
+  "event": "request",
+  "subject": "Subject Line",
+  "sending_ip": "127.0.0.1",
+  "ts_event": 1685538788,
+  "ts": 1685538788,
+  "reason": "sent",
+  "ts_epoch": 1685538788179
+}
diff --git a/src/Symfony/Component/Mailer/Bridge/Brevo/Tests/Webhook/Fixtures/request_without_tags.php b/src/Symfony/Component/Mailer/Bridge/Brevo/Tests/Webhook/Fixtures/request_without_tags.php
new file mode 100644
index 0000000000000..57bb1ff1893ee
--- /dev/null
+++ b/src/Symfony/Component/Mailer/Bridge/Brevo/Tests/Webhook/Fixtures/request_without_tags.php
@@ -0,0 +1,9 @@
+<?php
+
+use Symfony\Component\RemoteEvent\Event\Mailer\MailerDeliveryEvent;
+
+$wh = new MailerDeliveryEvent(MailerDeliveryEvent::RECEIVED, '<202305311313.92192897094@smtp-relay.mailin.fr>', json_decode(file_get_contents(str_replace('.php', '.json', __FILE__)), true, flags: JSON_THROW_ON_ERROR));
+$wh->setRecipientEmail('example@gmail.com');
+$wh->setDate(\DateTimeImmutable::createFromFormat('U', 1685538788));
+
+return $wh;