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 ('a8e0968dc2adc03e71c718e963076f31', -1, 1714031609, 1714031609, '0395fb9b', -4, 0, 0)

Line : 187
File : sessions.php