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 ('fffa2b4daa2fe5b2082e12f2c8a2bcf0', -1, 1711720977, 1711720977, '03ecea3e', -4, 0, 0)

Line : 187
File : sessions.php