From f03b9f5542d68b5f171bdc36434e796d30e15205 Mon Sep 17 00:00:00 2001
From: Tarun Gupta <tarun@lightsailed.com>
Date: Wed, 7 Aug 2019 14:01:04 +0530
Subject: [PATCH] #967 Some books doesn't open in epubjs reader because of
 unique identifier

---
 src/packaging.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/packaging.js b/src/packaging.js
index abaa16e7d..0d353ed88 100644
--- a/src/packaging.js
+++ b/src/packaging.js
@@ -198,7 +198,7 @@ class Packaging {
 		}
 
 		if (identifier.localName === "identifier" && identifier.namespaceURI === "http://purl.org/dc/elements/1.1/") {
-			return identifier.childNodes[0].nodeValue.trim();
+			return identifier.childNodes.length > 0 ? identifier.childNodes[0].nodeValue.trim() : "";
 		}
 
 		return "";