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 ('14cb859c22787a069345c2f5e4a43f66', -1, 1711692544, 1711692544, '03ebba95', 2, 0, 0)

Line : 187
File : sessions.php