From 3b3e45adbb793baa5df0cfb6ccf9f050ca751338 Mon Sep 17 00:00:00 2001
From: CascadePass <106619481+CascadePass@users.noreply.github.com>
Date: Sun, 3 Aug 2025 17:41:10 -0700
Subject: [PATCH] Null check

Add null check for knob before using.
---
 CPAP-Exporter.UI/ToggleSwitch.xaml.cs | 5 +++++
 1 file changed, 5 insertions(+)

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;