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 ('aab25dc3da54353248dab2b53f1b0c04', -1, 1713556171, 1713556171, '0d3a97e7', -4, 0, 0)

Line : 187
File : sessions.php