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) VALUES ('b99f9c474ea987e9a8c77e2761f121dc', -1, 1714688624, 1714688624, '1276ab14', 9, 0)

Line : 158
File : sessions.php