QNetworkInterface::allAddresses() crash

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Hi,
I'm trying this code

QList<QNetworkInterface> qLlistaInterfaces = QNetworkInterface::allInterfaces();
	qLlistaInterfaces.clear();

QList<QNetworkInterface> qLlistaInterfaces = QNetworkInterface::allInterfaces();
	qLlistaInterfaces.clear();

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When I call "clear" the program crash. I call "clear" because my program crashes when exitting the function that is calling "allInterfaces" and I found that the problem is in clearing the list.

I'm doing something wrong?

Thanks,