How to Fix OJS HTTP 500 Error: Duplicate Entry for sessions_pkey
When your OJS journal suddenly throws an HTTP 500 error and the Apache error log shows Duplicate entry for key ‘sessions_pkey’, the entire site — homepage, submissions, admin dashboard — can go offline. This error has been reported on OJS versions 3.3.0 through 3.4.0, and in some cases even after following the standard fixes, the […]

