Problem/Motivation
After clearing the cache on my site, I got a white screen with an error:"Uncaught PHP Exception Exception: "Could not connect to api, check your ID and SECRET" at /home/u540084/mysite.ru/www/modules/contrib/sendpulse_api/src/Plugin/ApiClient.php line 64"
After that, I just can't get the site back online. I checked the secret key and ID - everything is fine, they have not changed. I tried to register them directly in Setting - it also didn't help. After that, I deleted the line specified in the error from the file ApiClient.php. It helped and I saw the real cause of the problems instead of the white screen.:"Warning: Attempt to read property "id" on string in Drupal\sendpulse_api\Service\SendpulseApi->getMailingLists() (line 549 of modules/contrib/sendpulse_api/src/Service/SendpulseApi.php)."
Address books are missing in the module settings, they are not loaded from the Sendpulse website.
Steps to reproduce
Drupal 9.5.11. I use the type of materials that unauthorized users can add. There I add an invisible field with the type "Sendpulse Api Lists".
At the moment, it is not possible to specify in the field which address book the data will be sent to. But users can still create a type of material without getting any errors.
Proposed resolution
There was probably some kind of API update. It is necessary to correct the request and fix the problem when an invalid key prevents you from using the site after clearing the cache, causing a white screen.