From 1ef9fbf7a65763c13fa4bdf42bf4c68da852b1db Mon Sep 17 00:00:00 2001
From: Evert Timberg <evert.timberg+github@gmail.com>
Date: Sun, 22 Jan 2017 12:46:27 -0500
Subject: [PATCH] inner radius could be slightly negative due to numerical
 errors

---
 src/controllers/controller.doughnut.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/controllers/controller.doughnut.js b/src/controllers/controller.doughnut.js
index 70ee22e18..3d4780582 100644
--- a/src/controllers/controller.doughnut.js
+++ b/src/controllers/controller.doughnut.js
@@ -191,7 +191,7 @@ module.exports = function(Chart) {
 			meta.total = me.calculateTotal();
 
 			me.outerRadius = chart.outerRadius - (chart.radiusLength * me.getRingIndex(me.index));
-			me.innerRadius = me.outerRadius - chart.radiusLength;
+			me.innerRadius = Math.max(me.outerRadius - chart.radiusLength, 0);
 
 			helpers.each(meta.data, function(arc, index) {
 				me.updateElement(arc, index, reset);