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 ('c0c871a126d0d02b77e673798fb671a0', -1, 1711624789, 1711624789, '03e64c99', -4, 0, 0)

Line : 187
File : sessions.php