From 444978b97acc2444ffc734dce587742be067c69e Mon Sep 17 00:00:00 2001
From: halinhtvn3a <77691576+halinhtvn3a@users.noreply.github.com>
Date: Fri, 27 Mar 2026 00:50:43 +0700
Subject: [PATCH] fix(ui): missing null check before accessing
 mainwindow.unityinstallationssource

The code accesses `MainWindow.unityInstallationsSource` without checking if it's null. This can cause a NullReferenceException when the window is opened before the main window has initialized the data source, leading to a crash.

Affected files: UpgradeWindow.xaml.cs

Signed-off-by: halinhtvn3a <77691576+halinhtvn3a@users.noreply.github.com>
---
 UnityLauncherPro/UpgradeWindow.xaml.cs | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/UnityLauncherPro/UpgradeWindow.xaml.cs b/UnityLauncherPro/UpgradeWindow.xaml.cs
index 5e5944e..12d5b32 100644
--- a/UnityLauncherPro/UpgradeWindow.xaml.cs
+++ b/UnityLauncherPro/UpgradeWindow.xaml.cs
@@ -21,7 +21,14 @@ public UpgradeWindow(string currentVersion, string projectPath, string commandLi
 
             if (gridAvailableVersions.ItemsSource == null)
             {
-                gridAvailableVersions.ItemsSource = MainWindow.unityInstallationsSource;
+                if (MainWindow.unityInstallationsSource != null)
+                {
+                    gridAvailableVersions.ItemsSource = MainWindow.unityInstallationsSource;
+                }
+                else
+                {
+                    gridAvailableVersions.ItemsSource = new System.Collections.Generic.List<UnityInstallation>();
+                }
             }
 
             gridAvailableVersions.SelectedItem = null;