Segmentation Faul using addItem (QListWidget)

[spirit]

the mistake in ctor

QLabel *playerLabel = new QLabel(tr("Players:"));
QListWidget *playerView = new QListWidget();

QLabel *playerLabel = new QLabel(tr("Players:"));
QListWidget *playerView = new QListWidget();

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must be

playerLabel = new QLabel(tr("Players:"));
playerView = new QListWidget();

playerLabel = new QLabel(tr("Players:"));
playerView = new QListWidget();

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becuase you already have playerLabel, playerView as class member variables.