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 ('0376d76897abd3f4362fec57dfa0ad7c', -1, 1730801986, 1730801986, '2cc0430a', -4, 0, 0)

Line : 195
File : sessions.php