From a9cfb7f61367d5cbb6321c9d60e204dafec61688 Mon Sep 17 00:00:00 2001
From: Peter Foster <peter@ukdataservices.co.uk>
Date: Wed, 15 Apr 2026 03:06:17 +0100
Subject: [PATCH] Fix NullReferenceException in PriceSliderCard_ValueChanged

Slider ValueChanged fires during XAML init before named controls exist.
Guard with IsLoaded check, same pattern as UpdateCardTitleBar.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
---
 EbayListingTool/Views/PhotoAnalysisView.xaml.cs | 1 +
 1 file changed, 1 insertion(+)

diff --git a/EbayListingTool/Views/PhotoAnalysisView.xaml.cs b/EbayListingTool/Views/PhotoAnalysisView.xaml.cs
index 0e6b435..955f756 100644
--- a/EbayListingTool/Views/PhotoAnalysisView.xaml.cs
+++ b/EbayListingTool/Views/PhotoAnalysisView.xaml.cs
@@ -749,6 +749,7 @@ public partial class PhotoAnalysisView : UserControl
 
     private void PriceSliderCard_ValueChanged(object sender, RoutedPropertyChangedEventArgs<double> e)
     {
+        if (!IsLoaded) return;
         var price = (decimal)e.NewValue;
         SliderVerbalLabel.Text = NumberWords.ToVerbalPrice(price);
         SliderDigitLabel.Text  = $"£{price:F2}";