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 ('2dc9ba6f3d6056d400023722f46099e0', -1, 1713483168, 1713483168, '03913f88', -10, 0, 0)

Line : 187
File : sessions.php