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 ('1844e73cf97efac5b0a9af311d850f04', -1, 1730419882, 1730419882, '0389b2a9', 9, 0, 0)

Line : 195
File : sessions.php