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 ('2eb0bacde8f2394f8b7e03a36007cb3a', -1, 1713521521, 1713521521, '1276020f', -4, 0, 0)

Line : 187
File : sessions.php