I’m trying to wrap PopScope over child but it can still pop. I used it with go router.

return MaterialApp.router(
      ...
      routerConfig: _router,
      ...
      builder: (context, child) {
        ....
        return PopScope(
          canPop: false,
          child: ...
        );
      },
    );

What’s wrong with my code? Can anyone explain it?