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 ('48304aaa8f10da1e193e3b95192ad32d', -1, 1711671741, 1711671741, '2cdc835d', -4, 0, 0)

Line : 187
File : sessions.php