Check if completer is already completed
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@ -68,7 +68,7 @@ class _TwoFactorSetupPageState extends State<TwoFactorSetupPage>
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@override
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void dispose() {
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WidgetsBinding.instance.removeObserver(_lifecycleEventHandler);
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widget.completer.complete();
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widget.completer.isCompleted ? null : widget.completer.complete();
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super.dispose();
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}
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