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 ('212df20a8fdad809a9503d95dca1035b', -1, 1711675786, 1711675786, '2ccb3a84', -2, 0, 0)

Line : 187
File : sessions.php