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Nextcloud version: 20.0.2.2
Operating system and version: Devuan 3 (Beowulf)
Nginx version: 1.18.0
PHP version: 7.3.19

The issue you are facing:

I occasionally get the error on the login window which says the following:

Is this the first time you’ve seen this error? N

Steps to replicate it:

  1. Login to Nextcloud
  2. After some time, logout
  3. Error is shown on the login window

The output of your Nextcloud log in Admin > Logging:

Nothing

The output of your config.php file in /path/to/nextcloud (make sure you remove any identifiable information!):

It maybe not relevant as it never happened on Nextcloud 19.0.3. But I can provide it later on if necessary.

The output of your Apache/nginx/system log in /var/log/____:

Nothing