From 051f5b015bc9d1fb07cd23ec3bfc78e6e3914360 Mon Sep 17 00:00:00 2001
From: Zach Panzarino <zachary@panzarino.com>
Date: Fri, 16 Sep 2016 01:29:01 +0000
Subject: [PATCH] Fix bug with pie/doughnut chart legends Fixes a rendering
 issue when there are multiple datasets on a pie chart and they do not all
 contain the same number of data in their datasets Fixes #3309

---
 src/controllers/controller.doughnut.js | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/controllers/controller.doughnut.js b/src/controllers/controller.doughnut.js
index 0e9c5fe80..e0f378dae 100644
--- a/src/controllers/controller.doughnut.js
+++ b/src/controllers/controller.doughnut.js
@@ -76,7 +76,10 @@ module.exports = function(Chart) {
 
 				for (i = 0, ilen = (chart.data.datasets || []).length; i < ilen; ++i) {
 					meta = chart.getDatasetMeta(i);
-					meta.data[index].hidden = !meta.data[index].hidden;
+					// toggle visibility of index if exists
+					if (meta.data[index]) {
+						meta.data[index].hidden = !meta.data[index].hidden;
+					}
 				}
 
 				chart.update();
-- 
2.47.2