From be4a5a74d705d876b1f0e28debd8c49147b78e19 Mon Sep 17 00:00:00 2001
From: Andrew Arnott <andrewarnott@live.com>
Date: Mon, 14 Mar 2022 17:15:11 -0600
Subject: [PATCH] Fix NullReferenceException thrown when PATH is empty/missing

---
 src/Nerdbank.GitVersioning.Tasks/ContextAwareTask.cs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/Nerdbank.GitVersioning.Tasks/ContextAwareTask.cs b/src/Nerdbank.GitVersioning.Tasks/ContextAwareTask.cs
index f3bb3e17..7ba03cb6 100644
--- a/src/Nerdbank.GitVersioning.Tasks/ContextAwareTask.cs
+++ b/src/Nerdbank.GitVersioning.Tasks/ContextAwareTask.cs
@@ -56,7 +56,7 @@ public override bool Execute()
             // On .NET Framework (on Windows), we find native binaries by adding them to our PATH.
             if (this.UnmanagedDllDirectory is not null)
             {
-                string pathEnvVar = Environment.GetEnvironmentVariable("PATH");
+                string pathEnvVar = Environment.GetEnvironmentVariable("PATH") ?? string.Empty;
                 string[] searchPaths = pathEnvVar.Split(Path.PathSeparator);
                 if (!searchPaths.Contains(this.UnmanagedDllDirectory, StringComparer.OrdinalIgnoreCase))
                 {