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 ('a2b3c87d12dd9b83d9270d241c9a9e5f', -1, 1714006185, 1714006185, '1276020f', 5, 0, 0)

Line : 187
File : sessions.php