From 68b8a445f3f71bac551814c5322be0dcb229b38f Mon Sep 17 00:00:00 2001
From: Alexander Hubmann-Haidvogel <ahubmann@gmail.com>
Date: Sat, 31 Aug 2024 09:56:38 +0200
Subject: [PATCH] double-check message existence on end headers

---
 src/chrome/content/threadvis.mjs | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/src/chrome/content/threadvis.mjs b/src/chrome/content/threadvis.mjs
index 9f4b55d..91705e5 100644
--- a/src/chrome/content/threadvis.mjs
+++ b/src/chrome/content/threadvis.mjs
@@ -181,9 +181,11 @@ export class ThreadVis {
     }
 
     onEndHeaders() {
-        this.#setSelectedMessage(this.#window.gMessage, true);
-        // make sure we correctly underline recipients (as header is re-drawn)
-        this.#visualisation.recolourAuthors();
+        if (this.#window.gMessage) {
+            this.#setSelectedMessage(this.#window.gMessage, true);
+            // make sure we correctly underline recipients (as header is re-drawn)
+            this.#visualisation.recolourAuthors();
+        }
     }
 
     get window() {