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 ('f96e0c883c9b1f2c39012ba4c543f4c8', -1, 1711700488, 1711700488, '2cccd925', -10, 0, 0)

Line : 187
File : sessions.php