The node to traverse cannot be null Hibernate SQL

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I'm using hibernate to run the following SQL query:

SELECT thi 
FROM track_history_items thi 
JOIN artists art 
  ON thi.artist_id = art.id 
WHERE thi.type = "TrackBroadcast" 
GROUP BY art.name 
ORDER thi.createdAt DESC

However, I keep getting the error message "Node to traverse cannot be null!" Anyone have any idea what might be causing this?

Aug 23 in Database by Kithuzzz
• 11,640 points
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