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 ('d96dac2809fd64bd0d83a12734638068', -1, 1729819778, 1729819778, '038e0c38', -1, 0, 0)

Line : 172
File : sessions.php