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 ('d5d9b6b8a1a7d2a17b6a26076f467d5f', -1, 1711698738, 1711698738, '12ce4ca0', -10, 0, 0)

Line : 187
File : sessions.php