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 ('c946c2fd06367cc7957f62312f780d5f', -1, 1711671473, 1711671473, '6418148d', -2, 0, 0)

Line : 187
File : sessions.php