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 ('f297ab49f9c0f1b55064f3763d53b00e', -1, 1714625157, 1714625157, '340e554c', -4, 0, 0)

Line : 187
File : sessions.php