From 75c6814a5d45e628e1db72528a3db923bfb6b9c1 Mon Sep 17 00:00:00 2001
From: zorkow <volker.sorge@gmail.com>
Date: Wed, 6 Mar 2024 16:40:33 +0100
Subject: [PATCH] Fix maction tagname lookup error.

---
 ts/highlighter/chtml_highlighter.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/ts/highlighter/chtml_highlighter.ts b/ts/highlighter/chtml_highlighter.ts
index 0df5a87ec..8c7179294 100644
--- a/ts/highlighter/chtml_highlighter.ts
+++ b/ts/highlighter/chtml_highlighter.ts
@@ -32,7 +32,7 @@ export class ChtmlHighlighter extends CssHighlighter {
    * @override
    */
   public isMactionNode(node: HTMLElement) {
-    return node.tagName.toUpperCase() === this.mactionName.toUpperCase();
+    return node.tagName?.toUpperCase() === this.mactionName.toUpperCase();
   }
 
   /**