<Livedata room : dao query returns null> in my MVV...

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Livedata room : dao query returns null
in my MVVM project I am using live data queries to DAO to update the live data of the list of data in my ViewModel and then bind this livedata to adapter binded to recycler view in the fragment, it works correct except for the case when there are 2 queries in a row to room database , so it returns null pointer and doesn't properly update UI.
Part of the fragment code:
@AndroidEntryPoint
class HomeFragment : Fragment(),
NoteCardAdapter.NoteTouchListener,
SearchView.OnQueryTextListener{...