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 ('470dd3d471e2b302dd591585f6a9ad94', -1, 1754800778, 1754800778, 'd849d8fd', 9, 0, 0)

Line : 189
File : sessions.php