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 ('2dc7ae1f9618e88a0a8a6c8f4fd1293a', -1, 1594838738, 1594838738, '03ed2b44', 19, 0, 0)

Line : 172
File : sessions.php