fix segfault in eventhook on timeout.

src/eventhook.cpp

@@ -75,6 +75,7 @@ void p3::eventHook::event_worker() {
 }
 
 void p3::eventHook::handle_event(const std::array<std::string, 5>& args) {
+	std::lock_guard<std::mutex> g(callback_mutex);
 	for (auto c : callbacks) {
 		c(args[0], args[1], args[2], args[3], args[4]);
 	}

src/server.cpp

@@ -362,6 +362,8 @@ void p3::clientHandler::push_event(
 		const std::string& a4,
 		const std::string& a5
 		) {
+	if (!push_events_enabled) return;
+
 	std::lock_guard<std::recursive_mutex> g(connection_write_mutex);
 
 	try {
@@ -381,16 +383,16 @@ void p3::clientHandler::push_event(
 		}
 		connection.send(p3::protocol::ENDTEXT, "End Event", 1);
 	} catch (p3::perror & e) {
-		hook.unregister_callback(push_event_callback);
 		push_events_enabled = false;
-		std::thread t([this, e] () {
-			std::lock_guard<std::recursive_mutex> g(connection_write_mutex);
+		std::thread t([this, e] (auto evc) {
 			try {
+				hook.unregister_callback(evc);
+				std::lock_guard<std::recursive_mutex> g(connection_write_mutex);
 				connection.send(p3::protocol::ERROR, e.what() + std::string(" - Events disabled."));
-			} catch (p3::perror & e) {
+			} catch (p3::perror &) {
 				return;
 			}
-		});
+		}, push_event_callback);
 		t.detach();
 	}
 }