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 ('858ba5fbba3a0770555d167164c7640a', -1, 1713956797, 1713956797, '12e095f2', 4, 0, 0)

Line : 187
File : sessions.php