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 ('3c843ef8c02871655ce42bd0fcfa9f1f', -1, 1714034354, 1714034354, '12bff0f3', -7, 0, 0)

Line : 187
File : sessions.php