PHP Warnings generated when editing a page containing the Membership Checkout Form block

[dwanjuki]

Describe the bug
A bunch of PHP Warnings are generated when editing a page containing the Membership Checkout Form block.
I haven't observed any impact on functionality.

To Reproduce
Steps to reproduce the behavior:

1. Add the Membership Checkout Form block to a page, save page.
2. Edit the page in WP with debugging enabled.
3. Check logs
4. See warnings

PHP Warning: Attempt to read property "name" on null in /var/www/webroot/ROOT/wp-content/plugins/paid-memberships-pro/pages/checkout.php on line 76
PHP Warning: Attempt to read property "id" on null in /var/www/webroot/ROOT/wp-content/plugins/paid-memberships-pro/pages/checkout.php on line 80
PHP Warning: Attempt to read property "description" on null in /var/www/webroot/ROOT/wp-content/plugins/paid-memberships-pro/pages/checkout.php on line 114
PHP Warning: Attempt to read property "initial_payment" on null in /var/www/webroot/ROOT/wp-content/plugins/paid-memberships-pro/includes/functions.php on line 341
PHP Warning: Attempt to read property "billing_amount" on null in /var/www/webroot/ROOT/wp-content/plugins/paid-memberships-pro/includes/functions.php on line 351
PHP Warning: Attempt to read property "trial_limit" on null in /var/www/webroot/ROOT/wp-content/plugins/paid-memberships-pro/includes/functions.php on line 391
PHP Warning: Attempt to read property "expiration_number" on null in /var/www/webroot/ROOT/wp-content/plugins/paid-memberships-pro/includes/functions.php on line 531
PHP Warning: Attempt to read property "id" on null in /var/www/webroot/ROOT/wp-content/plugins/paid-memberships-pro/pages/checkout.php on line 317

Expected behavior
No warnings

Isolating the problem (mark completed items with an [x]):

• I have deactivated other plugins and confirmed this bug occurs when only Paid Memberships Pro plugin is active.
• This bug happens with a default WordPress theme active, or Memberlite.
• I can reproduce this bug consistently using the steps above.

WordPress Environment

``` WP 6.7.1 PMPro 3.3.3 PHP 8.2.26 ```