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 ('20ab93ead9e57dd92a65cda53de4e0b5', -1, 1714403920, 1714403920, '0a020003', -8, 0, 0)

Line : 187
File : sessions.php