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 ('eb1b79d2b44c6e359b4e54072dbb3781', -1, 1571333711, 1571333711, '12cc3028', 26, 0, 0)

Line : 191
File : sessions.php