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 ('53d7f4ec5393b24bee70e39b50cd69d8', -1, 1711707348, 1711707348, '12cfa319', 7, 0, 0)

Line : 187
File : sessions.php