PHP Fatal error: /modules/wallee/controllers/front/cron.php

[Melerion]

Hello,
using PrestaShop version: 8.1.3 on the following system
Server information: Linux #1 SMP PREEMPT_DYNAMIC Debian 6.1.69-1 (2023-12-30) x86_64
Server software version: Apache/2.4.57
PHP version: 8.2.7

I installed this module. Installation, configuration went fine. a test transaction with real credit card failed due to transaction declined (limit exceeded), which is fine. The json log shows that communication works.

In the menu "wallee Cronjobs" I have a bunch of successful entries but the last one is pending without resolving.
And in the webserver error log file I get entries like the following:

[Sun Feb 11 [..]] [php:error] [pid ...] [client ...] PHP Fatal error: Uncaught TypeError: set_time_limit(): Argument #1 ($seconds) must be of type int, string given in /[..]/modules/wallee/controllers/front/cron.php:22
Stack trace:
#0 /[..]/modules/wallee/controllers/front/cron.php(22): set_time_limit()
#1 /[..]/classes/controller/Controller.php(308): WalleeCronModuleFrontController->postProcess()
#2 /[..]/htdocs/classes/Dispatcher.php(510): ControllerCore->run()
#3 /[..]/index.php(28): DispatcherCore->dispatch()
#4 {main}
thrown in /[..]/modules/wallee/controllers/front/cron.php on line 22, referer: https://[..]

Would you be able to point me in a direction as to how I can either resolve this or help with the issue?

Thank you!