From c1c5dfebe6ce7c4383cfd574c2d555463dd114e7 Mon Sep 17 00:00:00 2001
From: Beda Kosata <bedrich.kosata@nic.cz>
Date: Thu, 26 Apr 2012 14:22:52 +0200
Subject: [PATCH] null should be converted into {} in deepcopy - fixes turning
 on/off highlightSeriesOpts

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

diff --git a/dygraph-utils.js b/dygraph-utils.js
index f5440c7..63411a5 100644
--- a/dygraph-utils.js
+++ b/dygraph-utils.js
@@ -598,7 +598,7 @@ Dygraph.updateDeep = function (self, o) {
           // DOM objects are shallowly-copied.
           self[k] = o[k];
         } else if (typeof(o[k]) == 'object') {
-          if (typeof(self[k]) != 'object') {
+          if (typeof(self[k]) != 'object' || self[k] === null) {
             self[k] = {};
           }
           Dygraph.updateDeep(self[k], o[k]);
-- 
2.7.4