Fix crash

app/src/main/java/net/pokeranalytics/android/ui/fragment/GraphFragment.kt

@@ -157,10 +157,12 @@ class GraphFragment : PokerAnalyticsFragment(), OnChartValueSelectedListener {
 			barChart.data = barData
 
 			dataSets.firstOrNull()?.let {
+				if (it.entryCount > 0) {
 					val entry = it.getEntryForIndex(0)
 					this.chartView?.highlightValue(entry.x, 0)
 				}
 			}
+		}
 
 		this.chartContainer.addView(this.chartView)