From 52723ad93381d2934132eacb7e3f56dc7c76dc78 Mon Sep 17 00:00:00 2001
From: Mannes <mannes@krukje.nl>
Date: Wed, 5 Oct 2016 17:14:48 +0200
Subject: [PATCH] Check for file exists before adding to zip. Adding a non
 existent file to ZipArchive can lead to archive not being created

---
 h5p.classes.php | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/h5p.classes.php b/h5p.classes.php
index 4a3203a..d9f1af2 100644
--- a/h5p.classes.php
+++ b/h5p.classes.php
@@ -1586,8 +1586,8 @@ Class H5PExport {
     foreach ($files as $file) {
       // Please note that the zip format has no concept of folders, we must
       // use forward slashes to separate our directories.
-      $zip->addFile($file->absolutePath, $file->relativePath);
-      $zip->addFile($rootPrefix . $file->absolutePath, $file->relativePath);
+      if (file_exists($file->absolutePath)) $zip->addFile($file->absolutePath, $file->relativePath);
+      if (file_exists($rootPrefix . $file->absolutePath)) $zip->addFile($rootPrefix . $file->absolutePath, $file->relativePath);
     }
 
     // Close zip and remove tmp dir