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 ('e57d6c332bcd2dbe1a3a7e74562c1245', -1, 1756907401, 1756907401, 'd849d87f', -9, 0, 0)

Line : 187
File : sessions.php