diff --git a/h5p-default-storage.class.php b/h5p-default-storage.class.php
index 696e8de..0c67341 100644
--- a/h5p-default-storage.class.php
+++ b/h5p-default-storage.class.php
@@ -85,7 +85,9 @@ class H5PDefaultStorage implements \H5PFileStorage {
    */
   public function cloneContent($id, $newId) {
     $path = $this->path . '/content/';
-    self::copyFileTree($path . $id, $path . $newId);
+    if (file_exists($path . $id)) {
+      self::copyFileTree($path . $id, $path . $newId);
+    }
   }
 
   /**