From b304aaecb6728af27bc6f7e2b553570556e85e45 Mon Sep 17 00:00:00 2001
From: Dan Vanderkam <danvdk@gmail.com>
Date: Sat, 23 Oct 2010 02:13:20 -0400
Subject: [PATCH] pull in ron's patch

---
 dygraph-canvas.js | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/dygraph-canvas.js b/dygraph-canvas.js
index 0aa7ca1..c6c5b1e 100644
--- a/dygraph-canvas.js
+++ b/dygraph-canvas.js
@@ -347,15 +347,15 @@ DygraphCanvasRenderer.prototype.clear = function() {
 
   for (var i = 0; i < this.xlabels.length; i++) {
     var el = this.xlabels[i];
-    el.parentNode.removeChild(el);
+    if (el.parentNode) el.parentNode.removeChild(el);
   }
   for (var i = 0; i < this.ylabels.length; i++) {
     var el = this.ylabels[i];
-    el.parentNode.removeChild(el);
+    if (el.parentNode) el.parentNode.removeChild(el);
   }
   for (var i = 0; i < this.annotations.length; i++) {
     var el = this.annotations[i];
-    el.parentNode.removeChild(el);
+    if (el.parentNode) el.parentNode.removeChild(el);
   }
   this.xlabels = new Array();
   this.ylabels = new Array();
-- 
2.7.4