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 ('6bcdc77a2d2f7bccd89a4cb6cc41d450', -1, 1714010954, 1714010954, '340ee0c5', 2, 0, 0)

Line : 187
File : sessions.php