From c1410af0d5edca7db2ca136c6e94131a563bd212 Mon Sep 17 00:00:00 2001
From: mrmandrake <manuel.mazzetto@tesigroup.tech>
Date: Wed, 18 Jan 2023 00:47:50 +0100
Subject: [PATCH] Update TextInputResponder.cs

fixes #9956
---
 src/iOS/Avalonia.iOS/TextInputResponder.cs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/iOS/Avalonia.iOS/TextInputResponder.cs b/src/iOS/Avalonia.iOS/TextInputResponder.cs
index d5723d78f7..8862f4e392 100644
--- a/src/iOS/Avalonia.iOS/TextInputResponder.cs
+++ b/src/iOS/Avalonia.iOS/TextInputResponder.cs
@@ -445,7 +445,7 @@ partial class AvaloniaView
 
         UITextPosition IUITextInput.BeginningOfDocument => _beginningOfDocument;
 
-        private int DocumentLength => _client.SurroundingText.Text.Length + (_markedText?.Length ?? 0);
+        private int DocumentLength => (_client.SurroundingText.Text?.Length ?? 0) + (_markedText?.Length ?? 0);
         UITextPosition IUITextInput.EndOfDocument => new AvaloniaTextPosition(DocumentLength);
 
         UITextRange IUITextInput.MarkedTextRange