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 ('75f4311a3d0124d07963bdfbff3e3251', -1, 1781003449, 1781003449, 'd849d8e6', -10, 0, 0)

Line : 189
File : sessions.php