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 ('a399423b9ccebe685d8c9a9f9d7b848d', -1, 1638359396, 1638359396, '34cda768', 33, 0, 0)

Line : 187
File : sessions.php