diff --git a/LayoutTests/imported/w3c/web-platform-tests/domxpath/node-sets-expected.txt b/LayoutTests/imported/w3c/web-platform-tests/domxpath/node-sets-expected.txt
index 08f6c2fb9ad0..91f5430f300c 100644
--- a/LayoutTests/imported/w3c/web-platform-tests/domxpath/node-sets-expected.txt
+++ b/LayoutTests/imported/w3c/web-platform-tests/domxpath/node-sets-expected.txt
@@ -1,3 +1,3 @@
 
-FAIL | operator should evaluate both sides of expressions with the same context node assert_equals: expected 2 but got 1
+PASS | operator should evaluate both sides of expressions with the same context node
 
diff --git a/Source/WebCore/xml/XPathPredicate.cpp b/Source/WebCore/xml/XPathPredicate.cpp
index b3316bee1300..8994bdb74c48 100644
--- a/Source/WebCore/xml/XPathPredicate.cpp
+++ b/Source/WebCore/xml/XPathPredicate.cpp
@@ -252,11 +252,16 @@ Union::Union(std::unique_ptr<Expression> lhs, std::unique_ptr<Expression> rhs)
 
 Value Union::evaluate() const
 {
+    EvaluationContext clonedContext(Expression::evaluationContext());
     Value lhsResult = subexpression(0).evaluate();
-    Value rhs = subexpression(1).evaluate();
+    Value rhsResult = [&] {
+        SetForScope<EvaluationContext> contextForScope(Expression::evaluationContext(), clonedContext);
+        return subexpression(1).evaluate();
+    }();
+    Expression::evaluationContext().hadTypeConversionError |= clonedContext.hadTypeConversionError;
 
     NodeSet& resultSet = lhsResult.modifiableNodeSet();
-    const NodeSet& rhsNodes = rhs.toNodeSet();
+    const NodeSet& rhsNodes = rhsResult.toNodeSet();
 
     HashSet<RefPtr<Node>> nodes;
     for (auto& result : resultSet)