From 356783e52b7820566508d04d4dd6c67a342dc9ac Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Tom=C3=A1=C5=A1=20Matou=C5=A1ek?=
 <tmat@users.noreply.github.com>
Date: Fri, 18 Nov 2022 13:52:29 -0600
Subject: [PATCH] Avoid potential NRE (#29128)

---
 src/BuiltInTools/dotnet-watch/HotReloadDotNetWatcher.cs | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/BuiltInTools/dotnet-watch/HotReloadDotNetWatcher.cs b/src/BuiltInTools/dotnet-watch/HotReloadDotNetWatcher.cs
index f2cf300fafbd..f33d6a1647b8 100644
--- a/src/BuiltInTools/dotnet-watch/HotReloadDotNetWatcher.cs
+++ b/src/BuiltInTools/dotnet-watch/HotReloadDotNetWatcher.cs
@@ -309,8 +309,8 @@ private void ConfigureExecutable(DotNetWatchContext context, ProcessSpec process
             }
 
             var rootVariableName = EnvironmentVariableNames.TryGetDotNetRootVariableName(
-                project.RuntimeIdentifier,
-                project.DefaultAppHostRuntimeIdentifier,
+                project.RuntimeIdentifier ?? "",
+                project.DefaultAppHostRuntimeIdentifier ?? "",
                 project.TargetFrameworkVersion);
 
             if (rootVariableName != null && string.IsNullOrEmpty(Environment.GetEnvironmentVariable(rootVariableName)))