Fragments hang after inserting data

I'm having trouble entering information using this code. The process executes and inserts normally, but from there it no longer loads my fragments and is only locked in a white screen. I'm starting with RxJava and I do not even know if the code is correct. Does anyone know how to solve this code or some other solution?

Dao

@Insert( onConflict = OnConflictStrategy.REPLACE )
fun insert( info: Information ) : Long

Repository

fun dbInsert( info: Information ) : Long? {
    return mDatabase?.daoInfo()?.insert( info )
}

RxJava

    Completable.fromRunnable {
        repository.dbInsert( info )
    }
            .subscribeOn( Schedulers.io() )
            .subscribe()

LoadFragment - ViewModel( app: Application ) : AndroidViewModel(app) {

        val fragMgr = supportFragmentManager

        if ( fragMgr.findFragmentByTag( TAG ) != null ) {
            return
        }
        val fragment = getFragment()

        val frgTransaction = fragMgr.beginTransaction()

        frgTransaction
                .replace( R.id.frag, fragment, TAG )
                .setCustomAnimations( android.R.anim.fade_in, android.R.anim.fade_out )
                .commitAllowingStateLoss()
                //.commit()