From eba6dd23fd5fcdac7c4490ea8cb3ac4c71613bff Mon Sep 17 00:00:00 2001
From: David Eberlein <david.eberlein@ch.sauter-bc.com>
Date: Thu, 11 Apr 2013 17:53:05 +0200
Subject: [PATCH] REFACTORING: Added exception if no y axis has the
 independentTicks option activated.

---
 dygraph.js | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/dygraph.js b/dygraph.js
index e7acc6d..bcf25e0 100644
--- a/dygraph.js
+++ b/dygraph.js
@@ -2736,7 +2736,8 @@ Dygraph.prototype.computeYAxisRanges_ = function(extremes) {
         p_axis = axis;
     }
   }
-  
+  if(p_axis == undefined)
+    throw ("Configuration Error: At least one axis has to have the \"independentTicks\" option activated.");
   // Add ticks. By default, all axes inherit the tick positions of the
   // primary axis. However, if an axis is specifically marked as having
   // independent ticks, then that is permissible as well.
-- 
2.7.4