From 07ee98ca377219d3aa3451aa316c8c4556a83b4a Mon Sep 17 00:00:00 2001
From: Siegfried Pammer <siegfriedpammer@gmail.com>
Date: Thu, 2 Dec 2021 17:49:16 +0100
Subject: [PATCH] #2564: lock list.lockObj as well.

---
 ILSpy/AssemblyList.cs | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/ILSpy/AssemblyList.cs b/ILSpy/AssemblyList.cs
index b58309b51..e89d2101f 100644
--- a/ILSpy/AssemblyList.cs
+++ b/ILSpy/AssemblyList.cs
@@ -88,7 +88,10 @@ namespace ICSharpCode.ILSpy
 		{
 			lock (lockObj)
 			{
-				this.assemblies.AddRange(list.assemblies);
+				lock (list.lockObj)
+				{
+					this.assemblies.AddRange(list.assemblies);
+				}
 			}
 			this.dirty = false;
 		}