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com.mysql.jdbc.exceptions.jdbc4.MySQLQueryInterruptedException: Query execution was interrupted

Query being executed when exception was thrown:
SELECT f.forum_id, f.forum_name, t.topic_id, t.topic_title, ad.attach_id, ad.real_filename, ad.filesize, ad.download_count FROM jforum_forums f, jforum_posts p, jforum_topics t, jforum_attach a, jforum_attach_desc ad WHERE p.topic_id = t.topic_id AND p.forum_id = f.forum_id and p.post_id = a.post_id AND a.attach_id = ad.attach_id AND a.privmsgs_id = 0 AND ad.download_count  0 ORDER BY ad.download_count DESC LIMIT 50