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 ('6e63a1e92076947db080cf6f0c5d2d90', -1, 1708712266, 1708712266, '2cdc3eb7', 7, 0, 0)

Line : 187
File : sessions.php