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 ('a4578965740f86df1d8469ed9b1ffd3b', -1, 1714029340, 1714029340, '03830dc2', -4, 0, 0)

Line : 187
File : sessions.php