From 9793abc61a1a1e5a58fcbc37d8a220c99e001754 Mon Sep 17 00:00:00 2001
From: straker <stevenlambert503@gmail.com>
Date: Fri, 14 Jul 2017 15:42:24 -0600
Subject: [PATCH] return false on undefined other node

---
 index.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/index.js b/index.js
index d01f0d9..58cfd63 100644
--- a/index.js
+++ b/index.js
@@ -17,5 +17,5 @@ module.exports = contains;
  */
 
 function contains (node, other) {
-  return node === other || !!(node.compareDocumentPosition(other) & 16);
+  return other && (node === other || !!(node.compareDocumentPosition(other) & 16) );
 }