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 ('a6e28e4fcbb7c5499fe93efa9f088018', -1, 1713531824, 1713531824, '03163df6', 4, 0, 0)

Line : 187
File : sessions.php