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 ('91ad0fed388cd6ee631a64ffd882cc8e', -1, 1710841594, 1710841594, '3655ff4a', 3, 0, 0)

Line : 187
File : sessions.php