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 ('638d3e9af9f51d1a8e0d7c47f0d5a247', -1, 1713870842, 1713870842, '12bfe458', -4, 0, 0)

Line : 187
File : sessions.php