Heap error after sync_close

[pkwong4321]

Based on the console example, I get
HEAP: Free Heap block 00E7A590 modified at 00E7ACC8 after it was freed
in visual studio after the main program block ends, did i miss something for cleanup?
Here is my code:

sio::client client;
connection_listener listener(client);

client.set_open_listener(std::bind(&connection_listener::on_connected, &listener));
client.connect("http://chat.socket.io");

g_lock.lock();
if (!g_connected)
    g_cond.wait(g_lock);
g_lock.unlock();

Sleep(1000);

client.sync_close();
client.clear_con_listeners();

[pkwong4321]

it's fine after i comment
m_client->remove_socket(m_nsp);
in void socket::impl::on_close()
probably that frees the object and some timers are still running?