diff --git a/src/Cache/Region/FileLockRegion.php b/src/Cache/Region/FileLockRegion.php
index 5a9ee67c11e..999d6dba1e5 100644
--- a/src/Cache/Region/FileLockRegion.php
+++ b/src/Cache/Region/FileLockRegion.php
@@ -156,7 +156,7 @@ public function evictAll(): bool
     {
         // The check below is necessary because on some platforms glob returns false
         // when nothing matched (even though no errors occurred)
-        $filenames = glob(sprintf('%s/*.%s', $this->directory, self::LOCK_EXTENSION));
+        $filenames = glob(sprintf('%s/*.%s', $this->directory, self::LOCK_EXTENSION)) ?: [];
 
         if ($filenames !== false) {
             foreach ($filenames as $filename) {