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 ('47ef108c4c06e7d13b5ee6b2ec5a5751', -1, 1634971766, 1634971766, '23acd9ae', 0, 0, 0)

Line : 187
File : sessions.php