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 ('120911a3170cfb5a749b1d351d9a7284', -1, 1730420975, 1730420975, '03933f00', -1280, 0, 0)

Line : 195
File : sessions.php