From 381c23c6baa9d6bfa8ceabf60107e85749bc8b58 Mon Sep 17 00:00:00 2001
From: Tom Brunet <thbrunet@us.ibm.com>
Date: Thu, 27 May 2021 08:48:48 -0500
Subject: [PATCH] Header bug, reported by Benoit

---
 accessibility-checker-engine/src/v2/aria/ARIAMapper.ts | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/accessibility-checker-engine/src/v2/aria/ARIAMapper.ts b/accessibility-checker-engine/src/v2/aria/ARIAMapper.ts
index e0816d2a9..dd316acfc 100644
--- a/accessibility-checker-engine/src/v2/aria/ARIAMapper.ts
+++ b/accessibility-checker-engine/src/v2/aria/ARIAMapper.ts
@@ -568,14 +568,13 @@ export class ARIAMapper extends CommonMapper {
             "h6": "heading",
             "header": function(element) {
                 let parent = element.parentNode;
-                let nodeName = parent.nodeName.toLowerCase();
                 // If nearest sectioningRoot or sectioningContent is body
-                while (parent) {
+                while (parent && parent.nodeType === 1) {
+                    let nodeName = parent.nodeName.toLowerCase();
                     if (sectioningRoots[nodeName] || sectioningContent[nodeName]) {
                         return (nodeName === "body") ? "banner" : null;
                     }
                     parent = parent.parentNode;
-                    nodeName = parent.nodeName.toLowerCase();
                 }
                 return null;
             },