diff --git a/inc/mailcollector.class.php b/inc/mailcollector.class.php
index 8bc6f527bab..ab795c97048 100644
--- a/inc/mailcollector.class.php
+++ b/inc/mailcollector.class.php
@@ -1033,7 +1033,11 @@ function buildTicket($uid, \Laminas\Mail\Storage\Message $message, $options = []
       $tkt['_do_not_check_users_id'] = 1;
       $body                          = $this->getBody($message);
 
-      $subject       = $message->subject;
+      try {
+         $subject = $message->getHeader('subject')->getFieldValue();
+      } catch (Laminas\Mail\Storage\Exception\InvalidArgumentException $e) {
+         $subject = null;
+      }
       $tkt['_message']  = $message;
 
       if (!Toolbox::seems_utf8($body)) {
diff --git a/tests/emails-tests/16-no-subject.eml b/tests/emails-tests/16-no-subject.eml
new file mode 100644
index 00000000000..101f0a07155
--- /dev/null
+++ b/tests/emails-tests/16-no-subject.eml
@@ -0,0 +1,27 @@
+Return-Path: normal@glpi-project.org
+Received: from 192.168.1.3 (LHLO mail.glpi-project.org) (192.168.1.3)
+ by mail.glpi-project.org with LMTP; Thu, 11 Jul 2019 14:36:19 +0200
+ (CEST)
+Received: from mail.glpi-project.org (localhost [127.0.0.1])
+    by mail.glpi-project.org (Postfix) with ESMTP id E93F77E80CDC
+    for <unittests@glpi-project.org>; Thu, 11 Jul 2019 14:36:19 +0200 (CEST)
+Received: from localhost (localhost [127.0.0.1])
+    by mail.glpi-project.org (Postfix) with ESMTP id DDBE07E80832
+    for <unittests@glpi-project.org>; Thu, 11 Jul 2019 14:36:19 +0200 (CEST)
+Received: from mail.glpi-project.org ([127.0.0.1])
+    by localhost (mail.glpi-project.org [127.0.0.1]) (amavisd-new, port 10026)
+    with ESMTP id 5TmiDey5TKGa for <unittest@glpi-project.org>;
+    Thu, 11 Jul 2019 14:36:19 +0200 (CEST)
+Received: from mail.glpi-project.org (localhost [127.0.0.1])
+    by mail.glpi-project.org (Postfix) with ESMTP id CAB177E806B4
+    for <unittests@glpi-project.org>; Thu, 11 Jul 2019 14:36:19 +0200 (CEST)
+Date: Thu, 11 Jul 2019 14:36:19 +0200 (CEST)
+From: Normal User <normal@glpi-project.org>
+To: GLPI debug <unittests@glpi-project.org>
+Message-ID: <799153164.8345898.1562848579774.JavaMail.zimbra@glpi-project.org>
+MIME-Version: 1.0
+Content-Type: text/plain; charset=utf-8
+Content-Transfer-Encoding: 7bit
+X-Mailer: Zimbra 8.0.9_GA_6191 (ZimbraWebClient - FF67 (Linux)/8.0.9_GA_6191)
+
+This is a mail without subject.
diff --git a/tests/imap/MailCollector.php b/tests/imap/MailCollector.php
index 18e59b92ddd..db9a1cf8386 100644
--- a/tests/imap/MailCollector.php
+++ b/tests/imap/MailCollector.php
@@ -320,7 +320,7 @@ public function testCollect() {
          ]
       ]);
 
-      $this->integer(count($iterator))->isIdenticalTo(8);
+      $this->integer(count($iterator))->isIdenticalTo(9);
       $names = [];
       while ($data = $iterator->next()) {
          $names[] = $data['name'];
@@ -336,6 +336,7 @@ public function testCollect() {
          'проверка',
          'тест2',
          'Inlined image with no Content-Disposition',
+         'This is a mail without subject.', // No subject = name is set using ticket contents
       ];
       $this->array($names)->isIdenticalTo($expected_names);