Steps to Reproduce

A small application to reproduce the bug(最小化可复现的demo)

1. A Activity contain a ViewPager ，ViewPager has two item,one is Fragment ,another is FlutterBoostFragment。
2. The Fragment adapter is

public class BaseFragmentPagerAdapter<T extends Fragment> extends FragmentPagerAdapter {
    protected List<T> mList;

    public BaseFragmentPagerAdapter(FragmentManager fm, List<T> list) {
        // 这里的第二个参数 不可以取消 FlutterBoostFragment 会崩溃
        super(fm, BEHAVIOR_RESUME_ONLY_CURRENT_FRAGMENT);
    }

1. when I open this Activity From FlutterPage ，then back to FlutterPage ，then try to Navigator.push() jump page,but it is notwork.
2. when I set FlutterBoostFragment is First item, Navigator.push() worked.

Flutter Boost Version
Target Platform:
Target OS version/browser:
Devices:

Logs

add your crash log or something else.