Code crashes during mutex lock in the member function

Facing a crash at mutex lock. this is the simulated scenario. The actual code passes the function pointer of a member function to another process and by the time that process calls this member function like a callback, objects created for this class are all deleted. the code crashes while locking of a mutex with error: Caught system_error with code generic:22 meaning Invalid argument My main concern is to handle this crash. is it possible to do any kind of null check to mutex in this scenario?

typedef std::function<void (const char *)> ResponseHandler;
class crash
{
        int i;
        std::recursive_mutex m_mutex;
        public:
        void onEvent(string s)
        {
                std::lock_guard<std::recursive_mutex> lock(m_mutex);
                cout << __FUNCTION__ << __LINE__ << " " << s << " " << i << endl;
        }
        ResponseHandler subscribe()
        {
                ResponseHandler handler = std::bind(&crash::onEvent, this, std::placeholders::_1);
                return handler;
        }
        crash()
        {
                cout << __FUNCTION__ << __LINE__ << endl;
                i = 100;
        }
        ~crash()
        {
                cout << __FUNCTION__ << __LINE__ << endl;
        }
};

int main()
{
        crash *c = new crash();
        ResponseHandler rh = c->subscribe();
        delete c;
        rh("hello");
        return 0;
}

this code produces the output as :

crash25
~crash30
onEvent16 hello 0