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 ('a88cc3df9f6701f57bbf43976991d3e5', -1, 1730418356, 1730418356, '0391a272', -1280, 0, 0)

Line : 195
File : sessions.php