Implementing own onWillPop result in cast error

[PcolBP]

When user will implement own onWillPop function and set handleAndroidBackButtonPress to false cast error will be displayed.

It happens because inside lib/persistent-tab-view.widget.dart function onWillPop is casted on as Future Function()? but '?' sign shouldn't be there since its not null.

Removing question sign from cast resolves problem.

[rulila52]

seems like package is not supported