From ce896debc2372934b04736fa87b9cac2307afbd2 Mon Sep 17 00:00:00 2001
From: Jan Krivanek <jankrivanek@microsoft.com>
Date: Wed, 22 May 2024 17:19:53 +0200
Subject: [PATCH] Fix nullref

---
 src/Build/Evaluation/Conditionals/OperatorExpressionNode.cs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/Build/Evaluation/Conditionals/OperatorExpressionNode.cs b/src/Build/Evaluation/Conditionals/OperatorExpressionNode.cs
index 34c7194b7a4..55cf768c60b 100644
--- a/src/Build/Evaluation/Conditionals/OperatorExpressionNode.cs
+++ b/src/Build/Evaluation/Conditionals/OperatorExpressionNode.cs
@@ -45,7 +45,7 @@ internal override string GetExpandedValue(ConditionEvaluator.IConditionEvaluatio
 
         /// <inheritdoc cref="GenericExpressionNode"/>
         internal override bool IsUnexpandedValueEmpty()
-            => LeftChild.IsUnexpandedValueEmpty() && RightChild.IsUnexpandedValueEmpty();
+            => (LeftChild?.IsUnexpandedValueEmpty() ?? true) && (RightChild?.IsUnexpandedValueEmpty() ?? true);
 
         /// <summary>
         /// Value before any item and property expressions are expanded