From d8620f35f5d5b0defbda8baa6b626b91ec48287a Mon Sep 17 00:00:00 2001
From: Marco Matteo Bassa <bassamarco91@gmail.com>
Date: Tue, 10 Nov 2026 17:16:45 +0100
Subject: [PATCH] Avoid GCC 15 null-dereference warning in ThreadSafeSignal

---
 include/behaviortree_cpp/utils/thread_safe_signal.h | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/include/behaviortree_cpp/utils/thread_safe_signal.h b/include/behaviortree_cpp/utils/thread_safe_signal.h
index 394a9ad30..07b3d36fb 100644
--- a/include/behaviortree_cpp/utils/thread_safe_signal.h
+++ b/include/behaviortree_cpp/utils/thread_safe_signal.h
@@ -49,7 +49,8 @@ class ThreadSafeSignal
     {
       const std::scoped_lock lock(mutex_);
       removeExpired();
-      subscribers = subscribers_;
+      // Copy-construct the snapshot to avoid a GCC 15 -Wnull-dereference false positive.
+      subscribers = decltype(subscribers)(subscribers_);
     }
     for(const auto& weak_subscriber : subscribers)
     {