Crash when redraw graph from 2 lines to 1 line with click on highlight

[bravevu]

My graph has 2 lines: line 1 & line 2. I click 1 point on line 2. Then, click 1 button to change to graph with 1 line, app crash. If I click point on line 1 and redraw graph 1 line, it is ok.
Bug in function:
public func getEntryForHighlight(highlight: ChartHighlight) -> ChartDataEntry
{
return _dataSets[highlight.dataSetIndex].entryForXIndex(highlight.xIndex);
}
I think because in graph 1 line not have information for highlight on line 2.
How to remove highlight on line 2 before redraw?

[bravevu]

Sorry, this is my fault. Need set highlightvalue to nil before redraw.