diff --git a/lib/private/TempManager.php b/lib/private/TempManager.php
index f5801e5ab98..fa7f891ca92 100644
--- a/lib/private/TempManager.php
+++ b/lib/private/TempManager.php
@@ -50,13 +50,14 @@ class TempManager implements ITempManager {
 		$path = $this->generateTemporaryPath($postFix);
 
 		$old_umask = umask(0077);
-		$fp = fopen($path, 'x');
+		$fp = @fopen($path, 'x');
 		umask($old_umask);
 		if ($fp === false) {
 			$this->log->warning(
 				'Can not create a temporary file in directory {dir}. Check it exists and has correct permissions',
 				[
 					'dir' => $this->tmpBaseDir,
+					'error' => error_get_last(),
 				]
 			);
 			return false;
@@ -71,11 +72,12 @@ class TempManager implements ITempManager {
 	public function getTemporaryFolder($postFix = ''): string|false {
 		$path = $this->generateTemporaryPath($postFix) . '/';
 
-		if (mkdir($path, 0700) === false) {
+		if (@mkdir($path, 0700) === false) {
 			$this->log->warning(
 				'Can not create a temporary folder in directory {dir}. Check it exists and has correct permissions',
 				[
 					'dir' => $this->tmpBaseDir,
+					'error' => error_get_last(),
 				]
 			);
 			return false;
diff --git a/tests/lib/TempManagerTest.php b/tests/lib/TempManagerTest.php
index d9261e2385a..cae7e9f8dd5 100644
--- a/tests/lib/TempManagerTest.php
+++ b/tests/lib/TempManagerTest.php
@@ -36,12 +36,7 @@ class TempManagerTest extends \Test\TestCase {
 		parent::tearDown();
 	}
 
-	/**
-	 * @param ?LoggerInterface $logger
-	 * @param ?IConfig $config
-	 * @return TempManager
-	 */
-	protected function getManager($logger = null, $config = null) {
+	protected function getManager(?LoggerInterface $logger = null, ?IConfig $config = null): TempManager {
 		if (!$logger) {
 			$logger = $this->createMock(LoggerInterface::class);
 		}