diff --git a/src/Dokuwiki/Filesystem.php b/src/Dokuwiki/Filesystem.php
index 9087a4c..03aa337 100644
--- a/src/Dokuwiki/Filesystem.php
+++ b/src/Dokuwiki/Filesystem.php
@@ -182,7 +182,10 @@ class Filesystem
             {
                 case is_dir($file):
 
-                    $this->_tree[$path] = [];
+                    if (!isset($this->_tree[$path]))
+                    {
+                        $this->_tree[$path] = [];
+                    }
 
                     $this->_index($file);