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 ('5dd6ee83a3f96bb6fcae7f63f9e1bff2', -1, 1709360940, 1709360940, '03ef0997', 0, 0, 0)

Line : 187
File : sessions.php