```ruby
module SessionsHelper
  def logged_in?
    session[:user].present?
  end

  def redirect_back_or(default)
    redirect_to(session[:original_url]||default)
  end

end
```

Add a white space after/before of || operator in SessionsHelper
user
```ruby
module SessionsHelper
  def logged_in?
    session[:user].present?
  end

  def redirect_back_or(default)
    redirect_to(session[:original_url] || default)
  end

end
```
assistant