diff --git a/plugins/downloader/back.js b/plugins/downloader/back.js
index a5a49958..5b1896de 100644
--- a/plugins/downloader/back.js
+++ b/plugins/downloader/back.js
@@ -70,3 +70,4 @@ function handle(win) {
 }
 
 module.exports = handle;
+module.exports.sendError = sendError;