diff --git a/src/Symfony/Component/Process/Process.php b/src/Symfony/Component/Process/Process.php
index cf551ef517900..f6701727424d7 100644
--- a/src/Symfony/Component/Process/Process.php
+++ b/src/Symfony/Component/Process/Process.php
@@ -1530,14 +1530,14 @@ private function requireProcessIsTerminated(string $functionName)
/**
* Escapes a string to be used as a shell argument.
*/
- private function escapeArgument(string $argument): string
+ private function escapeArgument(?string $argument): string
{
+ if ('' === $argument || null === $argument) {
+ return '""';
+ }
if ('\\' !== \DIRECTORY_SEPARATOR) {
return "'".str_replace("'", "'\\''", $argument)."'";
}
- if ('' === $argument = (string) $argument) {
- return '""';
- }
if (false !== strpos($argument, "\0")) {
$argument = str_replace("\0", '?', $argument);
}
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