bug (demo): Cannot Access Members Pages

[JJWren]

Description

Actual:
In the demo, when attempting to access the members pages (All, Active, and Inactive), you are greeted with an error:
ErrorException in MembersController.php line 42:
compact(): Undefined variable: old_sort

Expectation:
In the demo, when attempting to access the members pages (All, Active, and Inactive), one expects to be brought to the selected demo page.

Steps to Reproduce

1. Go to one of these member pages (All Members, Active Members, Inactive Members)
2. Get error screen with full error description:

Expected Behaviour

When attempting to access the members pages (All, Active, and Inactive), one expects to be brought to the selected demo page.

Screenshots / Screen Recording / Logs / Code Snippets

No response