connect QAction a signal to QAction b slot AND connect QAction b signal to QAction a slot

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Hello,
I want to set up 3 actions (a, b and c) in a toolbar they all connect to the same slot in the mainwindow (Hello()), and when b is toggled then c is disabled and the other way: when c is toggled then b is disabled.
Something like that:

m_toolBar = addToolBar(tr("selection"));

QAction *aAct = new QAction(tr("&a"), this);
aAct->setCheckable(true);
connect(aAct, &QAction::triggered, this, &MainWindow::Hello);
m_toolBar->addAction(aAct);

QAction *bAct = new QAction(tr("&b"), this);
bAct->setCheckable(true);
connect(bAct, &QAction::triggered, this, &MainWindow::Hello);
connect(bAct, &QAction::toggled, cAct, &QAction::setDisabled);
m_toolBar->addAction(bAct);

QAction *cAct = new QAction(tr("&c"), this);
cAct->setCheckable(true);
connect(cAct, &QAction::triggered, this, &MainWindow::Hello);
connect(cAct, &QAction::toggled, bAct, &QAction::setDisabled);
m_toolBar->addAction(cAct);

But when I do that, i have a crash. Someone can help me?

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problem solved: action c was not initialized ...
I should have write that instead:

m_toolBar = addToolBar(tr("selection"));

QAction *aAct = new QAction(tr("&a"), this);
aAct->setCheckable(true);
connect(aAct, &QAction::triggered, this, &MainWindow::Hello);
m_toolBar->addAction(aAct);

QAction *bAct = new QAction(tr("&b"), this);
bAct->setCheckable(true);
connect(bAct, &QAction::triggered, this, &MainWindow::Hello);
//connect(bAct, &QAction::toggled, cAct, &QAction::setDisabled);
m_toolBar->addAction(bAct);

QAction *cAct = new QAction(tr("&c"), this);
cAct->setCheckable(true);
connect(cAct, &QAction::triggered, this, &MainWindow::Hello);
connect(cAct, &QAction::toggled, bAct, &QAction::setDisabled);
connect(bAct, &QAction::toggled, cAct, &QAction::setDisabled); //<---
m_toolBar->addAction(cAct);