Index: vdr-plugin-fritzbox-1.5.3+git20200520-8-b56735f/libfritz++/Listener.cpp
===================================================================
--- vdr-plugin-fritzbox-1.5.3+git20200520-8-b56735f.orig/libfritz++/Listener.cpp	2020-08-31 12:35:17.529471966 +0200
+++ vdr-plugin-fritzbox-1.5.3+git20200520-8-b56735f/libfritz++/Listener.cpp	2020-08-31 12:35:17.525472037 +0200
@@ -41,13 +41,17 @@
 {
 	this->event = event;
 	thread = new std::thread(&Listener::run, this);
+	threadNativeHandle = thread->native_handle();
+	thread->detach();
 }
 
 Listener::~Listener()
 {
 	if (thread) {
 		cancelThread();
-		thread->join();
+		int r = pthread_cancel(threadNativeHandle);
+		if (r != 0)
+		    ERR(std::string{"could not cancel thread: "} + strerror(r));
 		delete thread;
 	}
 }
Index: vdr-plugin-fritzbox-1.5.3+git20200520-8-b56735f/libfritz++/Listener.h
===================================================================
--- vdr-plugin-fritzbox-1.5.3+git20200520-8-b56735f.orig/libfritz++/Listener.h	2020-08-31 12:35:17.529471966 +0200
+++ vdr-plugin-fritzbox-1.5.3+git20200520-8-b56735f/libfritz++/Listener.h	2020-08-31 12:35:17.525472037 +0200
@@ -59,6 +59,7 @@
 	EventHandler *event;
 	std::vector<int> activeConnections;
 	std::thread *thread;
+	pthread_t threadNativeHandle;
 	network::TcpClient *tcpClientPtr = nullptr;
 	Listener(EventHandler *event);
 	void handleNewCall(bool outgoing, int connId, std::string remoteNumber, std::string localParty, std::string medium);