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 ('04d8f1833e2fc28ee6bbe172b44c224f', -1, 1768520417, 1768520417, 'd849d80f', -4, 0, 0)

Line : 283
File : sessions.php