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 ('e2bd29b0a68e23c9cde1c078a80b25ce', -1, 1711618375, 1711618375, '2ccd0541', -4, 0, 0)

Line : 187
File : sessions.php