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 ('a6cd0a617a8f32a9fd004917ed182800', -1, 1711712385, 1711712385, '22e7f7fe', -4, 0, 0)

Line : 187
File : sessions.php