From acf8b8338a78500c594aae9250581a7a003fdffe Mon Sep 17 00:00:00 2001
From: Valentin <udaltsov.valentin@gmail.com>
Date: Sun, 14 Oct 2018 23:07:30 +0300
Subject: [PATCH] Remove Process::escapeArgument argument type hint

---
 src/Symfony/Component/Process/Process.php | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/src/Symfony/Component/Process/Process.php b/src/Symfony/Component/Process/Process.php
index cf551ef517..f670172742 100644
--- a/src/Symfony/Component/Process/Process.php
+++ b/src/Symfony/Component/Process/Process.php
@@ -1530,14 +1530,14 @@ class Process implements \IteratorAggregate
     /**
      * 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);
         }