diff --git a/snappymail/v/0.0.0/app/libraries/MailSo/Log/Drivers/StderrStream.php b/snappymail/v/0.0.0/app/libraries/MailSo/Log/Drivers/StderrStream.php
index eb09af466..89b56d886 100644
--- a/snappymail/v/0.0.0/app/libraries/MailSo/Log/Drivers/StderrStream.php
+++ b/snappymail/v/0.0.0/app/libraries/MailSo/Log/Drivers/StderrStream.php
@@ -20,6 +20,9 @@ class StderrStream extends \MailSo\Log\Driver
 {
 	protected function writeImplementation($mDesc) : bool
 	{
+		if (!\defined('STDERR')) {
+			\define('STDERR', \fopen('php://stderr', 'wb'));
+		}
 		return 0 < \fwrite(STDERR, $mDesc . "\n");
 	}