From 17b758986d0a999a0c39859ab6a7637529649be8 Mon Sep 17 00:00:00 2001
From: Niklas Keller <me@kelunik.com>
Date: Mon, 12 Jul 2021 22:20:01 +0200
Subject: [PATCH] Fix deprecation warning on PHP 8.1

---
 src/Driver/ParallelFile.php | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/Driver/ParallelFile.php b/src/Driver/ParallelFile.php
index 67e1278..035d16a 100644
--- a/src/Driver/ParallelFile.php
+++ b/src/Driver/ParallelFile.php
@@ -141,7 +141,10 @@ final class ParallelFile implements File
 
             try {
                 $data = yield $this->worker->enqueue(new Internal\FileTask('fread', [$length], $this->id));
-                $this->position += \strlen($data);
+
+                if ($data !== null) {
+                    $this->position += \strlen($data);
+                }
             } catch (TaskException $exception) {
                 throw new StreamException("Reading from the file failed", 0, $exception);
             } catch (WorkerException $exception) {