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 ('6205c6193e3bfab20d2950276c51b5f4', -1, 1596495732, 1596495732, '03e2f530', 0, 0, 0)

Line : 187
File : sessions.php