Object of type CodeIgniter\Session\Session is not callable

Can anyone suggest why this error would occur?

I'm referencing a view parameter like this:

Code:

Object <?php if (!isset($session) || !$session('logged_in')): ?>

The error is:

Object of type CodeIgniter\Session\Session is not callable

I recently upgraded to 4.3.3 but maybe I did something else also.

Simpler is always better