Same error here with
’appstore.experimental.enabled’ => true,
‘appstoreurl’ => ‘https://apps.nextcloud.com/api/v0’, just added.
First I thought that something broke due to my apache2 package upgrade, because upgrade time and first sight of error were quite close. But as the error occurred half an hour earlier, needed to be something else. Good to know that the error is handles here now.
Related issue on git-hub: Update to 0.3.4 fails