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 ('60016d60589f73226d3a4ccae1b40ab6', -1, 1711716604, 1711716604, '22c94516', -4, 0, 0)

Line : 187
File : sessions.php