When an update is available for Matomo and the files have been update, but the UI hasn't been loaded yet, the archiver shows the following error:

ERROR [2018-05-30 23:51:37] 1842966 Got invalid response from API request: ?module=API&method=API.get&idSite=13320&period=week&date=last3&format=php&trigger=archivephp. Response was 'a:2:{s:6:"result";s:5:"error";s:7:"message";s:160:"Piwik and/or some plugins have been upgraded to a new version. --> Please run the update process first. See documentation: https://matomo.org/docs/update/ ";}'

Even when there is no Update to be executed and it could record the new component version basically.

I totally understand it shouldn't execute any DB updates or other updates, but when there is no update available it should not fail.

Currently, it looks like it is needed to visit the UI afterwards.