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 ('79524394ee0d5b1ab4eac7ee5bb723b6', -1, 1711628138, 1711628138, '36e07cd9', 2, 0, 0)

Line : 187
File : sessions.php