diff --git a/system/src/Grav/Common/Twig/WriteCacheFileTrait.php b/system/src/Grav/Common/Twig/WriteCacheFileTrait.php
index ec0d93c2f..e20a2a43c 100644
--- a/system/src/Grav/Common/Twig/WriteCacheFileTrait.php
+++ b/system/src/Grav/Common/Twig/WriteCacheFileTrait.php
@@ -20,6 +20,10 @@ trait WriteCacheFileTrait
      */
     protected function writeCacheFile($file, $content)
     {
+        if (empty($file)) {
+            return;
+        }
+
         if (!isset(self::$umask)) {
             self::$umask = self::getGrav()['config']->get('system.twig.umask_fix', false);
         }