From ffa9857ff18daa3e456ec4e3b171dbe0295ba603 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Mart=C3=ADn=20Fern=C3=A1ndez?= <paziusss@gmail.com>
Date: Wed, 9 Sep 2020 17:59:57 +0200
Subject: [PATCH] ftp: guard against nil file (#6640)

Fixes #6636
---
 frontend/apps/cloudstorage/ftp.lua | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/frontend/apps/cloudstorage/ftp.lua b/frontend/apps/cloudstorage/ftp.lua
index 3f59f0968..61a1286b8 100644
--- a/frontend/apps/cloudstorage/ftp.lua
+++ b/frontend/apps/cloudstorage/ftp.lua
@@ -25,7 +25,13 @@ function Ftp:downloadFile(item, address, user, pass, path, close)
     local response = FtpApi:ftpGet(url, "retr")
     if response ~= nil then
         path = util.fixUtf8(path, "_")
-        local file = io.open(path, "w")
+        local file, err = io.open(path, "w")
+        if not file then
+            UIManager:show(InfoMessage:new{
+                text = T(_("Could not save file to %1:\n%2"), BD.filepath(path), err),
+            })
+            return
+        end
         file:write(response)
         file:close()
         local __, filename = util.splitFilePathName(path)