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 ('de8e6c4ffe0a2c8b70a69e0db641aab8', -1, 1714604871, 1714604871, '12d82292', -50, 0, 0)

Line : 187
File : sessions.php