From 6e23c445628f1e96300a93c8df568449858a21b7 Mon Sep 17 00:00:00 2001
From: Ahmad Chatila <47364209+chatilaah@users.noreply.github.com>
Date: Wed, 18 Jan 2023 21:55:12 +0200
Subject: [PATCH] Fixed NullReferenceException when closing the form
 RosDBG/MainWindow.cs

---
 RosDBG/MainWindow.cs              | 6 ++++++
 RosDBG/Properties/AssemblyInfo.cs | 4 ++--
 2 files changed, 8 insertions(+), 2 deletions(-)

diff --git a/RosDBG/MainWindow.cs b/RosDBG/MainWindow.cs
index 73b5408..1b4cc2d 100644
--- a/RosDBG/MainWindow.cs
+++ b/RosDBG/MainWindow.cs
@@ -401,6 +401,12 @@ namespace RosDBG
             about.ShowDialog(this); 
         }
 
+        protected override void OnFormClosing(FormClosingEventArgs e)
+        {
+            base.OnFormClosing(e);
+            dockPanel.ActiveDocumentChanged -= dockPanel_ActiveDocumentChanged;
+        }
+
         private void dockPanel_ActiveDocumentChanged(object sender, EventArgs e)
         {
             try
diff --git a/RosDBG/Properties/AssemblyInfo.cs b/RosDBG/Properties/AssemblyInfo.cs
index ce2e795..9319d7e 100644
--- a/RosDBG/Properties/AssemblyInfo.cs
+++ b/RosDBG/Properties/AssemblyInfo.cs
@@ -39,5 +39,5 @@ using System.Runtime.InteropServices;
 // will be increased as well. MSI installers must not be generated with the same Build Number
 // otherwise they won't upgrade the old installation!
 
-[assembly: AssemblyVersion("1.0.23.10")]
-[assembly: AssemblyFileVersion("1.0.23.10")]
+[assembly: AssemblyVersion("1.0.23.12")]
+[assembly: AssemblyFileVersion("1.0.23.12")]