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 ('4f5949da7d09c3a6568a9790d0b8a263', -1, 1713955208, 1713955208, '0395fc25', -8, 0, 0)

Line : 187
File : sessions.php