phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '-1' for key 'session_user_id'

INSERT INTO phpbb_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('6c49f7ba7e5d79fd34a00c254412bccd', -1, 1713264841, 1713264841, '340f3f91', -4, 0, 0)

Line : 187
File : sessions.php