From 8c28cfa5dcbef6e528bba5ccdd6247ff1c372475 Mon Sep 17 00:00:00 2001
From: Scalman <Scalman@users.noreply.github.com>
Date: Mon, 29 Jul 2019 04:19:24 +0200
Subject: [PATCH] fixed stacked chart bug when there are different stacks on
 columns. (#4029)

fix #3659
* fixed stacked chart bug when there are different stacks on columns.
* added empty array check
---
 Source/Charts/Renderers/BarChartRenderer.swift | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/Source/Charts/Renderers/BarChartRenderer.swift b/Source/Charts/Renderers/BarChartRenderer.swift
index 6b192051bb..e675ba2215 100644
--- a/Source/Charts/Renderers/BarChartRenderer.swift
+++ b/Source/Charts/Renderers/BarChartRenderer.swift
@@ -867,9 +867,12 @@ open class BarChartRenderer: BarLineScatterCandleBubbleRenderer
             } else {
                 stackLabel = nil
             }
-
+            
+            //Handles empty array of yValues
+            let yValue = vals.isEmpty ? 0.0 : vals[idx % vals.count]
+            
             elementValueText = dataSet.valueFormatter?.stringForValue(
-                vals[idx % stackSize],
+                yValue,
                 entry: e,
                 dataSetIndex: dataSetIndex,
                 viewPortHandler: viewPortHandler) ?? "\(e.y)"