Uncaught PHP Exception TypeError: "Drupal\ape\EventSubscriber\ApeSubscriber::setCacheHeader(): Argument #2 ($maxAge) must be of type int, null given, called in /ape/src/EventSubscriber/ApeSubscriber.php on line 137

@rahul_sankrit, I had followed the same steps which you mentioned but not able to replicate the issue on drupal 9.5 & drupal 10.1, Can you provide more information on it.
btw if you still getting the issue you can use $maxAge = is_null($maxAge) ? 0 : $maxAge; in ape/src/EventSubscriber/ApeSubscriber.php after line no 137.

chetan 11 → made their first commit to this issue’s fork.

Hi
Please check my solution in attached MR.
Thanks

Thank you everyone for your support I will try your suggestions and I will share the updates.

This is resolved now after updating the latest version of the APE module (8.x-1.6).

composer require 'drupal/ape:^1.6'

Thanks.