From 53d53af502fc44fa0b546933c3e569d97cab2b9e Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Elan=20Ruusam=C3=A4e?= <glen@pld-linux.org>
Date: Sat, 27 Mar 2021 13:43:44 +0200
Subject: [PATCH] Update to handle empty string

---
 src/Monolog/Handler/MailHandler.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/Monolog/Handler/MailHandler.php b/src/Monolog/Handler/MailHandler.php
index 7d702e7d..7a7b787d 100644
--- a/src/Monolog/Handler/MailHandler.php
+++ b/src/Monolog/Handler/MailHandler.php
@@ -70,7 +70,7 @@ abstract class MailHandler extends AbstractProcessingHandler
 
     protected function isHtmlBody(string $body): bool
     {
-        return $body[0] === '<';
+        return ($body[0] ?? null) === '<';
     }
 
     /**