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 ('f24e49f404d07be0519743e6642fce3a', -1, 1711690988, 1711690988, '1716ec5a', -4, 0, 0)

Line : 187
File : sessions.php