fix ChartsOrg#2099, avoid crash when some chart only allow 1 data set…

… but people will set more than that
chiahan1123 · Jun 5, 2017 · 4a65b41 · 4a65b41
1 parent b007b02
commit 4a65b41
Showing 1 changed file with 1 addition and 1 deletion.
diff --git 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