diff --git a/app/src/main/kotlin/info/appdev/chartexample/PiePolylineChartActivity.kt b/app/src/main/kotlin/info/appdev/chartexample/PiePolylineChartActivity.kt
index c65028cd4..300619e47 100644
--- a/app/src/main/kotlin/info/appdev/chartexample/PiePolylineChartActivity.kt
+++ b/app/src/main/kotlin/info/appdev/chartexample/PiePolylineChartActivity.kt
@@ -160,7 +160,7 @@ class PiePolylineChartActivity : DemoBase(), OnSeekBarChangeListener, OnChartVal
             }
 
             R.id.actionToggleValues -> {
-                binding.chart1.data!!.dataSets.forEach {
+                binding.chart1.data?.dataSets?.forEach {
                     it?.isDrawValues = !it.isDrawValues
                 }
                 binding.chart1.invalidate()