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 ('176f14bcdc8bc29e3ae4923076aa0121', -1, 1711680011, 1711680011, '03ed2e78', 3, 0, 0)

Line : 187
File : sessions.php