diff --git a/CPAP-Exporter.UI/ToggleSwitch.xaml.cs b/CPAP-Exporter.UI/ToggleSwitch.xaml.cs
index 3e8ecc3..5f27285 100644
--- a/CPAP-Exporter.UI/ToggleSwitch.xaml.cs
+++ b/CPAP-Exporter.UI/ToggleSwitch.xaml.cs
@@ -230,6 +230,11 @@ public Brush KnobDisabledBackgroundBrush
 
         private void AnimateKnob(bool isChecked)
         {
+            if (this.knob is null)
+            {
+                return;
+            }
+
             double margin = this.knob.Margin.Left + this.knob.Margin.Right;
             double travelDistance = this.track.ActualWidth - this.knob.ActualWidth - margin;