Qt Creator debugging in MSVC

Question

I use Qt 5.12.3, Qt Creator 4.9.1, MSVC 2017 x64 and debugger CDB. I'm doing a step-by-step debugging of this code:

    try
    {
        int a(458);
        throw a;
    }
    catch(int& a)
    {
        qDebug() << a;
    }

An exception occurs and it is displayed:

But I don't hit the catch block, the app just stops. How to fix this problem? Thanks.

P.S.: I saw this message and it does not work: