phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '-1' for key 'session_user_id'

INSERT INTO phpbb2_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('da52b21b6b84dd43bfd3aeb01ec5db4e', -1, 1582912890, 1582912890, '03e9d95b', -4, 0, 0)

Line : 189
File : sessions.php