diff --git a/thread_pool.cpp b/thread_pool.cpp
index 3782a7b..7e18c46 100644
--- a/thread_pool.cpp
+++ b/thread_pool.cpp
@@ -264,7 +264,23 @@ void ThreadPool::_worker_thread_func(void *user_data) {
 }
 
 void ThreadPool::register_update() {
-	SceneTree::get_singleton()->CONNECT("idle_frame", this, ThreadPool, update);
+	if (!SceneTree::get_singleton()) {
+		return;
+	}
+
+	if (!SceneTree::get_singleton()->is_connected("idle_frame", this, "update")) {
+		SceneTree::get_singleton()->CONNECT("idle_frame", this, ThreadPool, update);
+	}
+}
+
+void ThreadPool::unregister_update() {
+	if (!SceneTree::get_singleton()) {
+		return;
+	}
+
+	if (SceneTree::get_singleton()->is_connected("idle_frame", this, "update")) {
+		SceneTree::get_singleton()->DISCONNECT("idle_frame", this, ThreadPool, update);
+	}
 }
 
 void ThreadPool::update() {
@@ -330,6 +346,8 @@ void ThreadPool::apply_settings() {
 
 	_threads.resize(0);
 
+	unregister_update();
+
 	_use_threads = _use_threads_new;
 
 	if (_use_threads) {
@@ -455,5 +473,7 @@ void ThreadPool::_bind_methods() {
 	ClassDB::bind_method(D_METHOD("cancel_job_wait", "job"), &ThreadPool::cancel_job_wait);
 
 	ClassDB::bind_method(D_METHOD("register_update"), &ThreadPool::register_update);
+	ClassDB::bind_method(D_METHOD("unregister_update"), &ThreadPool::unregister_update);
+
 	ClassDB::bind_method(D_METHOD("update"), &ThreadPool::update);
 }
diff --git a/thread_pool.h b/thread_pool.h
index 6f17454..ae3c562 100644
--- a/thread_pool.h
+++ b/thread_pool.h
@@ -99,6 +99,8 @@ public:
 	static void _worker_thread_func(void *user_data);
 
 	void register_update();
+	void unregister_update();
+
 	void update();
 	void apply_settings();