From: Sean Sobey <SeanSobey@users.noreply.github.com>
Date: Sat, 10 Mar 2018 15:57:27 +0000 (+0200)
Subject: Add undefined guard for window.devicePixelRatio (#5324)
X-Git-Tag: v2.7.3~1^2~45
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=7f4b1d9715f3da507893cf145009c729fad3606b;p=thirdparty%2FChart.js.git

Add undefined guard for window.devicePixelRatio (#5324)
---

diff --git a/src/core/core.helpers.js b/src/core/core.helpers.js
index 347fd958e..d49451d18 100644
--- a/src/core/core.helpers.js
+++ b/src/core/core.helpers.js
@@ -502,7 +502,7 @@ module.exports = function(Chart) {
 			document.defaultView.getComputedStyle(el, null).getPropertyValue(property);
 	};
 	helpers.retinaScale = function(chart, forceRatio) {
-		var pixelRatio = chart.currentDevicePixelRatio = forceRatio || window.devicePixelRatio || 1;
+		var pixelRatio = chart.currentDevicePixelRatio = forceRatio || (typeof window !== 'undefined' && window.devicePixelRatio) || 1;
 		if (pixelRatio === 1) {
 			return;
 		}