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 ('7bbc1969a1133ac1bbf26ac2f9eab1e1', -1, 1711708106, 1711708106, '6b1589b8', -10, 0, 0)

Line : 187
File : sessions.php