nav_graph.xml

    ...
    <fragment
        android:id="@+id/speakersFragment"
        android:name="io.github.manuelernesto.listofspeakers.ui.SpeakersFragment"
        android:label="@string/txt_cadastro"
        tools:layout="@layout/fragment_speakers">
        <action
            android:id="@+id/to_homeFragment"
            app:destination="@id/homeFragment" />
        <argument
            android:name="Palestrante"
            android:defaultValue="@null"
            app:argType="io.github.manuelernesto.listofspeakers.data.Palestrante"
            app:nullable="true" />
    </fragment>
    
    ...