Article not found error

Describe the problem you’re having:
When clicking the link at the top of a feed item I get redirected to:
/ttrss/backend.php?op=article&method=redirect&id=410 (which is fine)

but then prints: <div class="alert alert-danger" id="">Artikel niet gevonden.</div>

If possible include steps to reproduce the problem:
For me it’s pretty much clicking any article (top link)

tt-rss version (including git commit id): f38a89a131

Platform (i.e. Linux distro, PHP, PostgreSQL, etc) versions:
Synology (linux), php7.2; mariadb10.

If anyone else has this, this turned out to be an old cookie from a previous install (before I went from http to https)