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 ('bfb0378b9f5d8a8ba97240c7160b5bf4', -1, 1711624441, 1711624441, '03eee4bf', 5, 0, 0)

Line : 187
File : sessions.php