diff --git a/src/scales/scale.radialLinear.js b/src/scales/scale.radialLinear.js
index 0bbc24d9583..55b23d6d011 100644
--- a/src/scales/scale.radialLinear.js
+++ b/src/scales/scale.radialLinear.js
@@ -413,7 +413,7 @@ module.exports = LinearScaleBase.extend({
 		var me = this;
 
 		if (helpers.isNullOrUndef(value)) {
-			value = NaN;
+			return NaN;
 		}
 
 		// Take into account half font size + the yPadding of the top value