Dialog executes in debug build but not release

[awhite1159]

I found the problem. When I call the slot:

void MainWindow::newNetwork() {
    if(!newnet) 
        newnet = new NewNetworkDialog(this);
    newnet->exec();
}

void MainWindow::newNetwork() {
    if(!newnet) 
        newnet = new NewNetworkDialog(this);
    newnet->exec();
}

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I declared it in newnetworkdialog.h as:

QDialog* newnet;

QDialog* newnet;

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I wrongly assumed it would initialize to zero. By adding to the MainWindow constructor:

newnet = 0;

newnet = 0;

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It works now. My apologies as this is a basic C++ issue. But my question is why did it work in debug mode and would there be a better way to initialize the newnet to point to null?