From 1d18a83a15c138f70b589682e3320524c2df158f Mon Sep 17 00:00:00 2001
From: Siegfried Pammer <siegfriedpammer@gmail.com>
Date: Wed, 11 Jul 2018 17:21:15 +0200
Subject: [PATCH] Fix NRE in AssemblyNameReference

---
 ICSharpCode.Decompiler/Metadata/AssemblyReferences.cs        | 2 +-
 ICSharpCode.Decompiler/Metadata/UniversalAssemblyResolver.cs | 2 ++
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/ICSharpCode.Decompiler/Metadata/AssemblyReferences.cs b/ICSharpCode.Decompiler/Metadata/AssemblyReferences.cs
index c54dcf975..1b5f41e2f 100644
--- a/ICSharpCode.Decompiler/Metadata/AssemblyReferences.cs
+++ b/ICSharpCode.Decompiler/Metadata/AssemblyReferences.cs
@@ -79,7 +79,7 @@ namespace ICSharpCode.Decompiler.Metadata
 				builder.Append(Name);
 				builder.Append(sep);
 				builder.Append("Version=");
-				builder.Append(Version.ToString(fieldCount: 4));
+				builder.Append((Version ?? UniversalAssemblyResolver.ZeroVersion).ToString(fieldCount: 4));
 				builder.Append(sep);
 				builder.Append("Culture=");
 				builder.Append(string.IsNullOrEmpty(Culture) ? "neutral" : Culture);
diff --git a/ICSharpCode.Decompiler/Metadata/UniversalAssemblyResolver.cs b/ICSharpCode.Decompiler/Metadata/UniversalAssemblyResolver.cs
index b9fa2f480..40b6f7b5b 100644
--- a/ICSharpCode.Decompiler/Metadata/UniversalAssemblyResolver.cs
+++ b/ICSharpCode.Decompiler/Metadata/UniversalAssemblyResolver.cs
@@ -248,6 +248,8 @@ namespace ICSharpCode.Decompiler.Metadata
 			return version.Major == 0 && version.Minor == 0 && version.Build == 0 && version.Revision == 0;
 		}
 
+		internal static Version ZeroVersion = new Version(0,0,0,0);
+
 		string GetCorlib(IAssemblyReference reference)
 		{
 			var version = reference.Version;