From 67e5021741bf21386d630a7b4a68ef567c012b6b Mon Sep 17 00:00:00 2001
From: Omri Litvak <9881966+omrilit@users.noreply.github.com>
Date: Wed, 18 Aug 2021 11:04:51 +0300
Subject: [PATCH] SAAS-2669: throw error explicitly using the callback instead
 of failing due to "Cannot read property 'filename' of undefined" (#1)

---
 lib/pdf.js | 1 +
 1 file changed, 1 insertion(+)

diff --git a/lib/pdf.js b/lib/pdf.js
index 46f2ce4..300abf5 100644
--- a/lib/pdf.js
+++ b/lib/pdf.js
@@ -45,6 +45,7 @@ function PDF (html, options) {
 PDF.prototype.toBuffer = function PdfToBuffer (callback) {
   this.exec(function execPdfToBuffer (err, res) {
     if (err) return callback(err)
+    if (!res) return callback(new Error('html-pdf: PDF generation failed due to an unknown reason'))
     fs.readFile(res.filename, function readCallback (err, buffer) {
       if (err) return callback(err)
       fs.unlink(res.filename, function unlinkPdfFile (err) {