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 ('985dd00ca0b37f08c07a7d1aadf375d8', -1, 1714164306, 1714164306, '1276a497', 6, 0, 0)

Line : 187
File : sessions.php