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 ('732a83351a5e8ce19839f65dbdad1eec', -1, 1711688541, 1711688541, '2cc63909', -10, 0, 0)

Line : 187
File : sessions.php