From 9c5b3ab4d8c7b454e5a33ae65a2d8d501fbf4ca7 Mon Sep 17 00:00:00 2001
From: Jan-Peter Zurek <j.zurek@swiftconsult.de>
Date: Thu, 10 Feb 2022 13:22:33 +0100
Subject: [PATCH] Fix null reference exception for Tasks.WhenAll.

---
 .../Animation/Transitions/Rotate3DTransition.cs                 | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/Avalonia.Visuals/Animation/Transitions/Rotate3DTransition.cs b/src/Avalonia.Visuals/Animation/Transitions/Rotate3DTransition.cs
index ebc8f44278..01d04dff6b 100644
--- a/src/Avalonia.Visuals/Animation/Transitions/Rotate3DTransition.cs
+++ b/src/Avalonia.Visuals/Animation/Transitions/Rotate3DTransition.cs
@@ -39,7 +39,7 @@ public class Rotate3DTransition: PageSlide
             return;
         }
 
-        var tasks = new Task[2];
+        var tasks = new Task[from != null && to != null ? 2 : 1];
         var parent = GetVisualParent(from, to);
         var (rotateProperty, center) = Orientation switch
         {