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 ('5dd8e0e69c39e94e1219258f0cc31160', -1, 1713904204, 1713904204, '12de16f4', -4, 0, 0)

Line : 187
File : sessions.php