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 ('f4e5a4df2b41e81daa8f7fb5fe63f935', -1, 1711675804, 1711675804, '03eb2ebf', 3, 0, 0)

Line : 187
File : sessions.php