From 5520d76e4332c1a782899679ffa8cca2285a70ce Mon Sep 17 00:00:00 2001
From: Ulrich-Matthias Schäfer <ulima.ums@googlemail.com>
Date: Sat, 26 May 2018 11:47:16 +0200
Subject: fixed `reference()` which failed when trying to use a reference which
 does not exist in the attribuets (#840)

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

(limited to 'src')

diff --git a/src/helpers.js b/src/helpers.js
index 5e6df04..d87ea9a 100644
--- a/src/helpers.js
+++ b/src/helpers.js
@@ -163,7 +163,7 @@ function fullBox(b) {
 
 // Get id from reference string
 function idFromReference(url) {
-  var m = url.toString().match(SVG.regex.reference)
+  var m = (url || '').toString().match(SVG.regex.reference)
 
   if (m) return m[1]
 }
-- 
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