From d451bb36b52a236acbae9a0c6b2fbad7cfaf4452 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Dariusz=20Komosi=C5=84ski?= <darek.komosinski@gmail.com>
Date: Tue, 23 Jun 2020 16:33:28 +0200
Subject: [PATCH] Use exception instead of an assert.

---
 src/Avalonia.Base/Data/Core/PropertyAccessorNode.cs | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/Avalonia.Base/Data/Core/PropertyAccessorNode.cs b/src/Avalonia.Base/Data/Core/PropertyAccessorNode.cs
index 52121e0a76..aa4fe55f79 100644
--- a/src/Avalonia.Base/Data/Core/PropertyAccessorNode.cs
+++ b/src/Avalonia.Base/Data/Core/PropertyAccessorNode.cs
@@ -73,7 +73,10 @@ namespace Avalonia.Data.Core
                 }
             }
 
-            Debug.Assert(accessor != null);
+            if (accessor is null)
+            {
+                throw new AvaloniaInternalException("Data validators must return non-null accessor.");
+            }
 
             _accessor = accessor;
             accessor.Subscribe(ValueChanged);