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 ('60ca8f1a5cd4e5c6cdc9c01f15c54e01', -1, 1711708681, 1711708681, '2cde7d72', -10, 0, 0)

Line : 187
File : sessions.php