From 52b60392b6407c93eccba1df5d8f536d325cabb8 Mon Sep 17 00:00:00 2001
From: Jessica Lord <jessica.lord@mongodb.com>
Date: Thu, 16 Nov 2017 09:33:44 -0500
Subject: [PATCH] fix(url parser): add check for options as cb

---
 lib/url_parser.js | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/lib/url_parser.js b/lib/url_parser.js
index 5dd5645581..3e8c934e9a 100644
--- a/lib/url_parser.js
+++ b/lib/url_parser.js
@@ -8,6 +8,9 @@ var ReadPreference = require('./read_preference'),
   dns = require('dns');
 
 module.exports = function(url, options, callback) {
+  if (typeof options === 'function') (callback = options), (options = {});
+  options = options || {};
+
   var result = parser.parse(url, true);
   if (result.protocol !== 'mongodb:' && result.protocol !== 'mongodb+srv:') {
     return callback(new Error('invalid schema, expected mongodb or mongodb+srv'));