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

exwm · Mar 10, 2018 · 7d22f4e · 7d22f4e
1 parent 7f6e2c0
commit 7d22f4e
Showing 1 changed file with 1 addition and 1 deletion.
diff --git 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;
 		}