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 ('12fc71c17c4c86e9f2a6b7fcba2b6414', -1, 1638584973, 1638584973, '36e361db', 46, 0, 0)

Line : 187
File : sessions.php