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 ('782be7b7ba3f5d968754c557d4b1db09', -1, 1748401735, 1748401735, '038a97a2', -9, 0, 0)

Line : 190
File : sessions.php