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 ('d9f1fb3e466a1d1775b419b460bcac0c', -1, 1711701081, 1711701081, '12cd4377', -4, 0, 0)

Line : 187
File : sessions.php