empty paginate if query with addBinding

I have Eloquent query with joins and conditions. The problem is that with this line, my query works weird:

$query->addSelect(DB::raw("IF(news.user_id= ? , 1, 0) as edit"))->addBinding($userId);

$query->get();               // returns collection of 27 items
$query->paginate(15);        // returns empty collection
$query->simplePaginate(15);  // returns collection of 15 items

can someone explain why this is happening with paginate()? Any solutions to get correctly paginate()?