From f85daa3d6e814a682148384afb1a5f903c457c19 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Em=C4=ABls=20Gulbis?= <emils.gulbis@gmail.com>
Date: Mon, 7 Oct 2019 14:45:16 +0300
Subject: [PATCH] Fix: Sometimes index === -1

Sometimes when mouse-overing container, i got `vendors.app.js:8427 Uncaught TypeError: Cannot read property 'xPos' of undefined` that is caused by `-1` index
---
 src/js/charts/AxisChart.js | 24 +++++++++++++-----------
 1 file changed, 13 insertions(+), 11 deletions(-)

diff --git a/src/js/charts/AxisChart.js b/src/js/charts/AxisChart.js
index 39a2b8b9..5e91fa8f 100644
--- a/src/js/charts/AxisChart.js
+++ b/src/js/charts/AxisChart.js
@@ -405,17 +405,19 @@ export default class AxisChart extends BaseChart {
 		if(!s.yExtremes) return;
 
 		let index = getClosestInArray(relX, s.xAxis.positions, true);
-		let dbi = this.dataByIndex[index];
-
-		this.tip.setValues(
-			dbi.xPos + this.tip.offset.x,
-			dbi.yExtreme + this.tip.offset.y,
-			{name: dbi.formattedLabel, value: ''},
-			dbi.values,
-			index
-		);
-
-		this.tip.showTip();
+		if (index >= 0) {
+			let dbi = this.dataByIndex[index];
+
+			this.tip.setValues(
+				dbi.xPos + this.tip.offset.x,
+				dbi.yExtreme + this.tip.offset.y,
+				{name: dbi.formattedLabel, value: ''},
+				dbi.values,
+				index
+			);
+
+			this.tip.showTip();
+		}
 	}
 
 	renderLegend() {