[deal.II] Why does putting the "TimerOuput" before the "ConditionalOStream" leads to a seg fault?

[Abbas B.]

I attached a simple .cc file that illustrates the tittle. 
Switching lines 18 and 19 leads to a segmentation fault and I would like to 
know why out of curiosity. 
Would appreciate it. Thanks 

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#include <deal.II/base/timer.h>
using namespace dealii;

template <int dim>
class LaplaceProblem
{
public:
    LaplaceProblem();

    void run();

private:
    void setup_system();

    MPI_Comm mpi_communicator;
    TimerOutput computing_timer;
    ConditionalOStream pcout;

};

template <int dim>
LaplaceProblem<dim>::LaplaceProblem()
    : mpi_communicator(MPI_COMM_WORLD), pcout(std::cout,
                                              (Utilities::MPI::this_mpi_process(mpi_communicator) == 0)),
      computing_timer(mpi_communicator,
                      pcout,
                      TimerOutput::never,
                      TimerOutput::wall_times)
{
}

template <int dim>
void LaplaceProblem<dim>::setup_system()
{
    TimerOutput::Scope t(computing_timer, "setup");
}
template <int dim>
void LaplaceProblem<dim>::run()
{
    setup_system();
    computing_timer.print_summary();
    computing_timer.reset();
}

int main(int argc, char *argv[])
{

    Utilities::MPI::MPI_InitFinalize mpi_initialization(argc, argv, 1);
    LaplaceProblem<2> laplace_problem_2d;
    laplace_problem_2d.run();
}