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 ('74cde4adf27bbff21c27e122430e7ef5', -1, 1635423320, 1635423320, '22ecbf68', 14, 0, 0)

Line : 187
File : sessions.php