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 ('48851b28c1ed8c038c6a72292a3e4a50', -1, 1730496712, 1730496712, '12756811', -1, 0, 0)

Line : 195
File : sessions.php