From 75b639924d57eeb49c55c5e5d3f74bbd743395c4 Mon Sep 17 00:00:00 2001
From: Patrick Pircher <patricklx@users.noreply.github.com>
Date: Fri, 12 Jul 2024 18:30:37 +0200
Subject: [PATCH] do not use prototype extension (#2587)

---
 ember_debug/deprecation-debug.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/ember_debug/deprecation-debug.js b/ember_debug/deprecation-debug.js
index c331297c69..794493cc47 100644
--- a/ember_debug/deprecation-debug.js
+++ b/ember_debug/deprecation-debug.js
@@ -107,7 +107,7 @@ export default class extends DebugPort {
             if (source) {
               source.found = true;
             } else {
-              source = mapped.firstObject;
+              source = mapped[0];
               source.found = false;
             }
             return source;