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 ('064b4f930db39b6cb8129b992f2adb6b', -1, 1714017701, 1714017701, '12743fec', -4, 0, 0)

Line : 187
File : sessions.php