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java.lang.ArrayIndexOutOfBoundsException: length=40; index=40	at com.github.mikephil.charting.buffer.BarBuffer.addBar(BarBuffer.java:37)	at com.github.mikephil.charting.buffer.BarBuffer.feed(BarBuffer.java:82)	at com.github.mikephil.charting.renderer.BarChartRenderer.drawDataSet(BarChartRenderer.java:95)	at com.github.mikephil.charting.renderer.BarChartRenderer.drawData(BarChartRenderer.java:74)