diff --git a/CHANGELOG.md b/CHANGELOG.md
index 2008625..d861bab 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,9 @@
 
 All notable changes to this project will be documented in this file.
 
+## [1.15.13] - 2023-02-22
+- Fixed: invalid syntax
+
 ## [1.15.12] - 2023-01-09
 - Changed: allow phpfastcache 7 for usage in projects with php 8
 - Changed: adapt usage of phpfastcache to work with the new version
diff --git a/library/Haste/Cache/FileCache.php b/library/Haste/Cache/FileCache.php
index d3837f6..a08128c 100644
--- a/library/Haste/Cache/FileCache.php
+++ b/library/Haste/Cache/FileCache.php
@@ -18,8 +18,12 @@ class FileCache extends Cache
 
     protected static $driver = 'files';
 
-    protected static function extendOptions($config = new ConfigurationOption): ConfigurationOption
+    protected static function extendOptions($config = null): ConfigurationOption
     {
+        if (!$config) {
+            $config = new ConfigurationOption();
+        }
+
         $filename = TL_ROOT . '/' . ltrim(self::$cacheDir, '/');
 
         if (!is_dir($filename)) {