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 ('9818cb1e4291e35cbd11043b9526f216', -1, 1714004814, 1714004814, '12e3727d', -4, 0, 0)

Line : 187
File : sessions.php