From a07f5bc6a27519df2d227f7b2ba6c5ec6813f280 Mon Sep 17 00:00:00 2001
From: terrafrost <terrafrost@gmail.com>
Date: Fri, 1 May 2020 21:34:44 -0500
Subject: [PATCH] SFTP: realpath('') produced an error

---
 phpseclib/Net/SFTP.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/phpseclib/Net/SFTP.php b/phpseclib/Net/SFTP.php
index e39fabed4..59c760bab 100644
--- a/phpseclib/Net/SFTP.php
+++ b/phpseclib/Net/SFTP.php
@@ -778,7 +778,7 @@ function _realpath($path)
             }
         }
 
-        if ($path[0] != '/') {
+        if (!strlen($path) || $path[0] != '/') {
             $path = $this->pwd . '/' . $path;
         }