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 ('0474d7332a9b8d266129d49067d25a16', -1, 1711720331, 1711720331, '2cc5c324', -4, 0, 0)

Line : 187
File : sessions.php