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 ('4f71ae275f7af4276a49e31b789109ea', -1, 1594834330, 1594834330, '03ed2b44', -8, 0, 0)

Line : 172
File : sessions.php