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 ('0f1a7eb1397cbdc2c1b1c1d9d3b829a2', -1, 1615285318, 1615285318, '03ef9e24', -20, 0, 0)

Line : 189
File : sessions.php