diff --git a/src/Symfony/Component/Mailer/Transport/Smtp/Stream/AbstractStream.php b/src/Symfony/Component/Mailer/Transport/Smtp/Stream/AbstractStream.php
index 2b8afd4c6fa67..804b339503161 100644
--- a/src/Symfony/Component/Mailer/Transport/Smtp/Stream/AbstractStream.php
+++ b/src/Symfony/Component/Mailer/Transport/Smtp/Stream/AbstractStream.php
@@ -75,7 +75,7 @@ public function readLine(): string
}
$line = fgets($this->out);
- if ('' === $line) {
+ if ('' === $line || false === $line) {
$metas = stream_get_meta_data($this->out);
if ($metas['timed_out']) {
throw new TransportException(sprintf('Connection to "%s" timed out.', $this->getReadConnectionDescription()));
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