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 ('692f779a93b94a946e311862410b520c', -1, 1711707060, 1711707060, '03ef60e5', -7, 0, 0)

Line : 187
File : sessions.php