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 ('f0a8efef1082b0af4c71de2ca3bc7c3b', -1, 1714026919, 1714026919, '340f3f91', 5, 0, 0)

Line : 187
File : sessions.php