From 2369ea1d500dc2ecea8e355bc2f5692a0a45cc3c Mon Sep 17 00:00:00 2001
From: Philipp Holzer <admin+github@philipp.info>
Date: Thu, 15 Aug 2019 17:55:17 +0200
Subject: [PATCH] Fix Lock-Unlink - Check if .sem file exists before unlinking
 it - Fixing
 https://github.com/friendica/friendica/issues/7298#issuecomment-521670482

---
 src/Core/Lock/SemaphoreLock.php | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/src/Core/Lock/SemaphoreLock.php b/src/Core/Lock/SemaphoreLock.php
index 75c7284a5f..0f41f9f309 100644
--- a/src/Core/Lock/SemaphoreLock.php
+++ b/src/Core/Lock/SemaphoreLock.php
@@ -68,8 +68,10 @@ class SemaphoreLock extends Lock
 
 		if (!empty(self::$semaphore[$key])) {
 			try {
-				$success = @sem_release(self::$semaphore[$key]) &&
-				           unlink(self::keyToFile($key));
+				$success = @sem_release(self::$semaphore[$key]);
+				if (file_exists(self::keyToFile($key)) && $success) {
+					$success = unlink(self::keyToFile($key));
+				}
 				unset(self::$semaphore[$key]);
 				$this->markRelease($key);
 			} catch (\Exception $exception) {