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 ('870c1d474c1138cf97c64d0db7f4bd0d', -1, 1711697705, 1711697705, '36d087ae', 2, 0, 0)

Line : 187
File : sessions.php