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 ('955bc29a9af713eda3b9a81e46b1df75', -1, 1714001615, 1714001615, '0389dda3', -4, 0, 0)

Line : 187
File : sessions.php