phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '-1' for key 'phpbb_sessions.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 ('381a01f962d4aa00d664f1891852bc2b', -1, 1664239893, 1664239893, '12d0bb80', -7, 0, 0)

Line : 187
File : sessions.php