From 4a65b41e651a6797314e522efcf9590d4a64aa91 Mon Sep 17 00:00:00 2001
From: Xuan Liu <liuxuan30@gmail.com>
Date: Mon, 5 Jun 2017 10:12:07 +0800
Subject: [PATCH] fix #2099, avoid crash when some chart only allow 1 data set
 but people will set more than that

---
 Source/Charts/Renderers/LegendRenderer.swift | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Source/Charts/Renderers/LegendRenderer.swift b/Source/Charts/Renderers/LegendRenderer.swift
index 0731a1574e..e5096b1d7a 100755
--- a/Source/Charts/Renderers/LegendRenderer.swift
+++ b/Source/Charts/Renderers/LegendRenderer.swift
@@ -44,7 +44,7 @@ open class LegendRenderer: Renderer
             // loop for building up the colors and labels used in the legend
             for i in 0..<data.dataSetCount
             {
-                let dataSet = data.getDataSetByIndex(i)!
+                guard let dataSet = data.getDataSetByIndex(i) else { continue }
                 
                 var clrs: [NSUIColor] = dataSet.colors
                 let entryCount = dataSet.entryCount