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 ('6fcc513ef2a506cadd2590f0b99446a4', -1, 1730418947, 1730418947, '038acc60', -1280, 0, 0)

Line : 195
File : sessions.php