diff --git a/search/classes/document.php b/search/classes/document.php
index 7ed70558781..97cdc7b9396 100644
--- a/search/classes/document.php
+++ b/search/classes/document.php
@@ -231,6 +231,8 @@ class document implements \renderable, \templatable {
 
                 if ($file = $fs->get_file_by_id($id)) {
                     $this->files[$id] = $file;
+                } else {
+                    unset($this->files[$id]); // Index is out of date and referencing a file that does not exist.
                 }
             }
         }