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 ('644c270ba48dc58a5480ea56511e5750', -1, 1711644699, 1711644699, '345b0044', -7, 0, 0)

Line : 187
File : sessions.php