diff --git a/packages/update-manager/main.js b/packages/update-manager/main.js
index 409d13e..ea739fb 100644
--- a/packages/update-manager/main.js
+++ b/packages/update-manager/main.js
@@ -84,6 +84,7 @@ module.exports = {
         Editor.Builder.removeListener('build-finished', doMakeUpdatePackage);
         if (this.ftp) {
             this.ftp.destroy();
+			this.ftp = null;
         }
     },
     messages: {