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 ('e837a4d1e7b742c5a1a517d8dc210da5', -1, 1596729707, 1596729707, '03eb6bd1', -4, 0, 0)

Line : 187
File : sessions.php