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 ('89e067e3507bf064158e60d6a83c050b', -1, 1711670441, 1711670441, '36e368e5', -10, 0, 0)

Line : 187
File : sessions.php