diff --git a/snappymail/v/0.0.0/app/libraries/MailSo/Mail/Message.php b/snappymail/v/0.0.0/app/libraries/MailSo/Mail/Message.php
index 9f854e2b9..16fb3cac1 100644
--- a/snappymail/v/0.0.0/app/libraries/MailSo/Mail/Message.php
+++ b/snappymail/v/0.0.0/app/libraries/MailSo/Mail/Message.php
@@ -325,7 +325,7 @@ class Message
 		return $this->aFlagsLowerCase;
 	}
 
-	public function From() : \MailSo\Mime\EmailCollection
+	public function From() : ?\MailSo\Mime\EmailCollection
 	{
 		return $this->oFrom;
 	}