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 ('088dcc3ef2013ee99e6c786b86767ddc', -1, 1714621584, 1714621584, '12dd9a97', -2, 0, 0)

Line : 187
File : sessions.php