From 403452c321a517d82624cca4f57306e72a7eb624 Mon Sep 17 00:00:00 2001
From: Niklas Keller <me@kelunik.com>
Date: Sun, 17 Sep 2017 19:16:18 +0200
Subject: [PATCH] Fix ProcessInputStream

---
 lib/ProcessInputStream.php | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/lib/ProcessInputStream.php b/lib/ProcessInputStream.php
index ec43048..d152aa8 100644
--- a/lib/ProcessInputStream.php
+++ b/lib/ProcessInputStream.php
@@ -27,7 +27,9 @@ class ProcessInputStream implements InputStream {
         $resourceStreamPromise->onResolve(function ($error, $resourceStream) {
             if ($error) {
                 $this->error = new StreamException("Failed to launch process", 0, $error);
-                $this->initialRead->fail($this->error);
+                if ($this->initialRead) {
+                    $this->initialRead->fail($this->error);
+                }
                 return;
             }