mercuryboard has exited with an error

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Unknown column 't.Forum' in 'on clause'

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Query Error [1054]:
This type of error is reported by MySQL.

Query:
SELECT t.TID, t.Forum, t.Title, p.Time FROM mb_topics t, mb_posts p LEFT JOIN mb_forums f ON f.forum_id=t.Forum WHERE t.TID=p.Topic AND p.post_author=19 ORDER BY p.Time DESC LIMIT 1

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