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 ('fe73f4c9af954f403eb183db37b6d745', -1, 1708480104, 1708480104, '22ec8681', -10, 0, 0)

Line : 187
File : sessions.php