It's seems that when i disconnect from my application i got a crash (Exception: EXC_BAD_ACCESS (code=EXC_I386_GPFLT)) with the following stacktrace:

boost::asio::detail::conditionally_enabled_mutex::scoped_lock::scoped_lock(boost::asio::detail::conditionally_enabled_mutex&) conditionally_enabled_mutex.hpp:53
boost::asio::detail::conditionally_enabled_mutex::scoped_lock::scoped_lock(boost::asio::detail::conditionally_enabled_mutex&) conditionally_enabled_mutex.hpp:52
unsigned long boost::asio::detail::kqueue_reactor::cancel_timer<boost::asio::time_traits<boost::posix_time::ptime> >(boost::asio::detail::timer_queue<boost::asio::time_traits<boost::posix_time::ptime> >&, boost::asio::detail::timer_queue<boost::asio::time_traits<boost::posix_time::ptime> >::per_timer_data&, unsigned long) kqueue_reactor.hpp:66
boost::asio::detail::deadline_timer_service<boost::asio::time_traits<boost::posix_time::ptime> >::cancel(boost::asio::detail::deadline_timer_service<boost::asio::time_traits<boost::posix_time::ptime> >::implementation_type&, boost::system::error_code&) deadline_timer_service.hpp:145
boost::asio::detail::deadline_timer_service<boost::asio::time_traits<boost::posix_time::ptime> >::destroy(boost::asio::detail::deadline_timer_service<boost::asio::time_traits<boost::posix_time::ptime> >::implementation_type&) deadline_timer_service.hpp:98
boost::asio::detail::io_object_impl<boost::asio::detail::deadline_timer_service<boost::asio::time_traits<boost::posix_time::ptime> >, boost::asio::executor>::~io_object_impl() io_object_impl.hpp:117
boost::asio::detail::io_object_impl<boost::asio::detail::deadline_timer_service<boost::asio::time_traits<boost::posix_time::ptime> >, boost::asio::executor>::~io_object_impl() io_object_impl.hpp:116
boost::asio::basic_deadline_timer<boost::posix_time::ptime, boost::asio::time_traits<boost::posix_time::ptime>, boost::asio::executor>::~basic_deadline_timer() basic_deadline_timer.hpp:315
boost::asio::basic_deadline_timer<boost::posix_time::ptime, boost::asio::time_traits<boost::posix_time::ptime>, boost::asio::executor>::~basic_deadline_timer() basic_deadline_timer.hpp:314
web::http::client::details::asio_connection_pool::~asio_connection_pool() http_client_asio.cpp:374
web::http::client::details::asio_connection_pool::~asio_connection_pool() http_client_asio.cpp:374
std::__1::__shared_ptr_emplace<web::http::client::details::asio_connection_pool, std::__1::allocator<web::http::client::details::asio_connection_pool> >::__on_zero_shared() memory:3709
std::__1::__shared_count::__release_shared() memory:3543
std::__1::__shared_weak_count::__release_shared() memory:3585
std::__1::shared_ptr<QApplication>::~shared_ptr() memory:4521
std::__1::shared_ptr<QApplication>::~shared_ptr() memory:4519
web::http::client::details::asio_client::~asio_client() http_client_asio.cpp:472
web::http::client::details::asio_client::~asio_client() http_client_asio.cpp:472
std::__1::__shared_ptr_emplace<web::http::client::details::asio_client, std::__1::allocator<web::http::client::details::asio_client> >::__on_zero_shared() memory:3709
std::__1::__shared_count::__release_shared() memory:3543
std::__1::__shared_weak_count::__release_shared() memory:3585
std::__1::shared_ptr<QApplication>::~shared_ptr() memory:4521
std::__1::shared_ptr<QApplication>::~shared_ptr() memory:4519
web::http::client::http_pipeline::~http_pipeline() http_client.cpp:283
web::http::client::http_pipeline::~http_pipeline() http_client.cpp:283
std::__1::__shared_ptr_emplace<web::http::client::http_pipeline, std::__1::allocator<web::http::client::http_pipeline> >::__on_zero_shared() memory:3709
std::__1::__shared_count::__release_shared() memory:3543
std::__1::__shared_weak_count::__release_shared() memory:3585
std::__1::shared_ptr<QApplication>::~shared_ptr() memory:4521
std::__1::shared_ptr<QApplication>::~shared_ptr() memory:4519
web::http::client::http_client::~http_client() http_client.cpp:398
web::http::client::http_client::~http_client() http_client.cpp:398
std::__1::default_delete<web::http::client::http_client>::operator()(web::http::client::http_client*) const memory:2338
std::__1::unique_ptr<web::http::client::http_client, std::__1::default_delete<web::http::client::http_client> >::reset(web::http::client::http_client*) memory:2651
std::__1::unique_ptr<web::http::client::http_client, std::__1::default_delete<web::http::client::http_client> >::~unique_ptr() memory:2605
std::__1::unique_ptr<web::http::client::http_client, std::__1::default_delete<web::http::client::http_client> >::~unique_ptr() memory:2605
__cxa_finalize_ranges 0x00007fff6a42413c
exit 0x00007fff6a424412
start 0x00007fff6a37acd0
start 0x00007fff6a37acc9

Creation of my object:

inline std::unique_ptr<web::http::client::http_client> g_mm2_http_client{nullptr};

static inline void
    create_mm2_httpclient()
    {
        web::http::client::http_client_config cfg;
        using namespace std::chrono_literals;
        cfg.set_timeout(30s);
        g_mm2_http_client = std::make_unique<web::http::client::http_client>(FROM_STD_STR(g_endpoint), cfg);
    }

I spawn some tasks (http_post requests), and for each of those tasks i add a continuous task for catching exception:

inline void
handle_exception_pplx_task(pplx::task<void> previous_task)
{
    try
    {
        previous_task.wait();
    }
    catch (const std::exception& e)
    {
        spdlog::error("pplx task error: {}", e.what());
    }
}

::mm2::api::async_rpc_batch_standalone(batch_array)
                .then([this, tickers](web::http::http_response resp) {
                    spdlog::trace("Enabling coin finished");
                    auto answers = ::mm2::api::basic_batch_answer(resp);
                    spdlog::trace("Enabling coin parsed");

                    if (answers.count("error") == 0)
                    {
                        for (auto&& answer: answers) { this->process_batch_enable_answer(answer); }
                        batch_balance_and_tx(false, tickers, true);
                        //! At this point, task is finished, let's refresh.
                    }
                })
                .then(&handle_exception_pplx_task);

Did i miss something ? seems to have some cleanup difficulty when i quit the app.