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 ('71b80bc59d8ded3c22e2a68ecd9b09f9', -1, 1714004906, 1714004906, '0390f3b8', -4, 0, 0)

Line : 187
File : sessions.php