From 75aea9d1db81c5f52e740fad74885491ab7c1023 Mon Sep 17 00:00:00 2001
From: Ilya Pospelov <pos777@gmail.com>
Date: Tue, 5 Mar 2024 05:27:45 +0300
Subject: [PATCH] Backport fix NullReferenceException in  X11Window.Activate
 (#14787)

---
 src/Avalonia.X11/X11Window.cs | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/Avalonia.X11/X11Window.cs b/src/Avalonia.X11/X11Window.cs
index 95900f72a04..8e9c92864c7 100644
--- a/src/Avalonia.X11/X11Window.cs
+++ b/src/Avalonia.X11/X11Window.cs
@@ -1103,7 +1103,9 @@ public void Activate()
             else
             {
                 XRaiseWindow(_x11.Display, _handle);
-                XSetInputFocus(_x11.Display, _focusProxy._handle, 0, IntPtr.Zero);
+
+                if (_focusProxy is not null)
+                    XSetInputFocus(_x11.Display, _focusProxy._handle, 0, IntPtr.Zero);
             }
         }