From ec7ac44b875968e58f42d3df0a795366a81e74c7 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Burak=20Kaan=20K=C3=B6se?= <bkaankose@outlook.com>
Date: Fri, 3 Oct 2025 15:49:44 +0200
Subject: [PATCH] fix nre on updating thumbnails

---
 Wino.Mail.ViewModels/Collections/WinoMailCollection.cs | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/Wino.Mail.ViewModels/Collections/WinoMailCollection.cs b/Wino.Mail.ViewModels/Collections/WinoMailCollection.cs
index 3425bcfa..459a4867 100644
--- a/Wino.Mail.ViewModels/Collections/WinoMailCollection.cs
+++ b/Wino.Mail.ViewModels/Collections/WinoMailCollection.cs
@@ -304,7 +304,9 @@ public class WinoMailCollection
             {
                 foreach (var item in group)
                 {
-                    if (item is MailItemViewModel mailItemViewModel && mailItemViewModel.MailCopy.FromAddress.Equals(address, StringComparison.OrdinalIgnoreCase))
+                    if (item is MailItemViewModel mailItemViewModel &&
+                    !string.IsNullOrEmpty(mailItemViewModel.MailCopy?.FromAddress) &&
+                    mailItemViewModel.MailCopy.FromAddress.Equals(address, StringComparison.OrdinalIgnoreCase))
                     {
                         mailItemViewModel.ThumbnailUpdatedEvent = !mailItemViewModel.ThumbnailUpdatedEvent;
                     }