Add this in father fragment.

FragmentInFragment.java

	/**
	 * This seems to be a bug in the newly added support for nested fragments.
	 * Basically, the child FragmentManager ends up with a broken internal state
	 * when it is detached from the activity. A short-term workaround that fixed
	 * it for me is to add the following to onDetach() of every Fragment which
	 * you call getChildFragmentManager() on:
	 */
	@Override
	public void onDetach() {
		super.onDetach();
		try {
			Field childFragmentManager = Fragment.class
					.getDeclaredField("mChildFragmentManager");
			childFragmentManager.setAccessible(true);
			childFragmentManager.set(this, null);

		} catch (NoSuchFieldException e) {
			e.printStackTrace();
			Logger.d("----- MainPopularFragment onDetach NoSuchFieldException ----");
		} catch (IllegalAccessException e) {
			e.printStackTrace();
			Logger.d("----- MainPopularFragment onDetach IllegalAccessException ----");
		}
	}