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 ('35734e2ac2b69a7d5740e0238d52a99f', -1, 1713511059, 1713511059, '1276019e', -11, 0, 0)

Line : 187
File : sessions.php